removing inputs, didn't know they are secret

day25: wow, part 1
day25: removing cycles
2023-12-25 09:39:34 +00:00 · 2023-12-25 09:37:10 +00:00 · 2023-12-25 08:44:16 +00:00 · 2023-12-25 07:53:45 +00:00 · 2023-12-25 07:53:17 +00:00 · 2023-12-24 12:36:08 +00:00
114 changed files with 10860 additions and 3789 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /.direnv/
 /.go
+input
+*.png
--- a/day1/input
+++ b/day1/input
--- a/day10/input
+++ b/day10/input
@@ -1,140 +0,0 @@
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-LLJF-L-|7..7LFJ...-7JJLJJFF||L-7||FJ|.LFL-7|||||J|7|JFFJJL||L7F7|L7F7L7F7J|||||L-7L7JJ|J.LJ||JL7||||FJ-||JJJL-||JJ||.F7LJ-L--J.|.F7L-L-J-||.
-|L-JFJ7LF77|FJLFF7F7FF-JJ7|LJLFJ|||L|7FF--J|LJ||L-7J|-|JFFJL7||LJFJ|L7LJL7FJ||L7FL-J.L7-|7J||FL||||||7FLJ7.|.|LJL-7-FJ||FFJ-F777FLF.FJ7JL-J7
-F-J.F-FJLJ-J7--J..|L---J7LJLL7L7|LJL||LL--7L-7LJ77L-|LF.FL7FJLJ-FJFJJ|F--JL7|L7|7J||7FF7|-..FL-LJLJ||J|LLJF-77FF7-|7||LL|L7--JL77-F7F.F--7LF
-J.J-7.J-FJ-L7J.---J7.LLJ|-L7FJ7LJJ.LF7F|F-JF-J7FF7..JFJ7|LLJ7|7LL7|JFJL---7LJ.LJ..F|J7JF7LLJ.LJFJ7.LJJ77J.7.|-7JFF.7||FJJLLF7FJJF.LJL-|.LJJ|
-|-|--F.||7.FJ-|JJLFJL7|FL7.-7FLJL7--JLF-L7FJJ-L7.LL7.|.LL-|7LL7-LLJ-L-7F--JFJ7|7L7JJ|.F-JL|F7JFJ-|-|JJ|-7FF-F77JFJ-FFF--7LF7-7.7L-..|L|JF|JL
--7-||-7LJ--.-F-7-L7JF77.F-.-|.|||FJ7.-J7LJ.|LL|7||LJLF7L-7-JFF7F7LJ.L||JFJ-.7J7-||F77J7.L|L7.7L-LF7.7JLJ7L|||J|.|-F-LJ7J7||L7FJF|-F7FLJFF7|
-J-.F7J-J|L-|-FJ-F--7LLJ-J-.F7|F--JJFJF|L-L7F7.|.L-FJ|LL-7F|LF7.-JLL.7.||.|J|F--||LL7|J-F7.|-|7L7.||||J-|.-.|J||--F.--L||F7.J-J-J|LFLFF7.|.F|
-|-LFJJJLLJLJ.FJF--7J-.LJL-JLLL-L-F-7-|J.|LJJ.LFJJ-LLL.LLLJ|JLJ|-LL-FJLLJ-J7--LJLL-LJ.|LL-FJJLLLJ.L|JJLF|-J-JLJ-FJ.FJ.L|LLJL..LJFJL-FJJLJ--FJ
--- a/day11/dayEleven.go
+++ b/day11/dayEleven.go
@@ -0,0 +1,109 @@
+package day11
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func Run() int64 {
+	fmt.Println("hello day 11")
+
+	filename := "day11/input"
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("cannot read file ", filename))
+	}
+
+	text := strings.TrimSpace( string(bytes) )
+	starCoords := make([]StarCoord, 0)
+
+	lines := strings.Split(text, "\n")
+
+	nonEmptyRows := make(map[int]any)
+	nonEmptyCols := make(map[int]any)
+
+	for rowNum, line := range lines {
+		for colNum, symb := range line {
+			if symb == '#' {
+				starCoords = append(starCoords, StarCoord{rowNum, colNum})
+				nonEmptyCols[colNum] = struct{}{}
+				nonEmptyRows[rowNum] = struct{}{}
+			}
+		}
+	}
+
+	emptyRowsAbove := make([]int, len(lines))
+	emptyColsToTheLeft := make([]int, len(lines))
+
+	for rowNum, _ := range lines {
+		if rowNum > 0 {
+			emptyRowsAbove[rowNum] = emptyRowsAbove[rowNum-1]
+		}
+		_, isRowNonempty := nonEmptyRows[rowNum]
+		if !isRowNonempty {
+			emptyRowsAbove[rowNum] += 1
+		}
+	}
+
+	for colNum, _ := range lines[0] {
+		if colNum > 0 {
+			emptyColsToTheLeft[colNum] = emptyColsToTheLeft[colNum-1]
+		}
+		_, isColNonempty := nonEmptyCols[colNum]
+		if !isColNonempty {
+			emptyColsToTheLeft[colNum] += 1
+		}
+	}
+
+	var distanceSum int64
+	for i := 0; i < len(starCoords); i++ {
+		for j := i+1; j < len(starCoords); j++ {
+			// calc distance between stars i and j
+			starA := starCoords[i]
+			starB := starCoords[j]
+
+			maxRow := starA.Row
+			minRow := starB.Row
+
+			if maxRow < minRow {
+				maxRow, minRow = minRow, maxRow
+			}
+
+			var multiplier int64
+			multiplier = 1000000 - 1
+
+			emptyRowsBetween := int64(emptyRowsAbove[maxRow]) - int64(emptyRowsAbove[minRow])
+
+			rowDistance := int64(maxRow) - int64(minRow) + emptyRowsBetween*multiplier
+
+			maxCol := starA.Col
+			minCol := starB.Col
+			if maxCol < minCol {
+				maxCol, minCol = minCol, maxCol
+			}
+
+			emptyColsBetween := int64(emptyColsToTheLeft[maxCol]) - int64(emptyColsToTheLeft[minCol])
+
+			colDistance := int64(maxCol) - int64(minCol) + emptyColsBetween*multiplier
+
+			distance := rowDistance + colDistance
+			log.Printf("between stars %d %+v and %d %+v distance is %d. emptyColsBetween %d ; emptyRowsBetween %d\n", i, j, starA, starB, distance, emptyColsBetween, emptyRowsBetween)
+			distanceSum += int64(distance)
+		}
+	}
+
+	// oh, i have list of all stars, i can just iterate over them and
+	// only keep rowNums for which there are stars. yeah
+
+	fmt.Println(starCoords)
+	fmt.Println(emptyRowsAbove)
+	fmt.Println(emptyColsToTheLeft)
+
+	return distanceSum
+}
+
+type StarCoord struct {
+	Row, Col int
+}
--- a/day11/example
+++ b/day11/example
@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....
--- a/day12/dayTwelve.go
+++ b/day12/dayTwelve.go
@@ -0,0 +1,184 @@
+package day12
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+func Run() int {
+	fmt.Println("hello day 12.")
+
+	start := time.Now()
+
+	filename := "day12/input"
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprintf("error reading file %s\n", filename))
+	}
+
+	result := 0
+	text := string(bytes)
+	text = strings.TrimSpace(text)
+
+	// testMask, testBlocks := ReadLine(".??..??...?##. 1,1,3")
+	// blocksSum := 0
+	// for _, block := range testBlocks {
+	// 	blocksSum += block
+	// }
+	// testVariants := generatePermutations("", len(testMask), testBlocks, blocksSum, testMask)
+	// fmt.Printf("for mask %s and blocks %+v\n", testMask, testBlocks)
+	// for _, variant := range testVariants {
+	// 	fmt.Println(variant)
+	// }
+
+	var wg sync.WaitGroup
+	lines := strings.Split(text, "\n")
+	wg.Add(len(lines))
+
+	matches := make(chan int)
+	go func() {
+		wg.Wait()
+		close(matches)
+	}()
+
+	for i, line := range lines {
+		go func(line string, lineNum int){
+			mask, blockLengs := ReadLine(line)
+
+			blockLengthSum := 0
+			for _, blockLen := range blockLengs {
+				blockLengthSum += blockLen
+			}
+
+			memo := make(map[string]int)
+			variantsCount := generatePermutations("", len(mask), blockLengs, blockLengthSum, mask, memo)
+
+			log.Printf("%d : for line %s blocks %+v matches %d\n", lineNum, mask, blockLengs, variantsCount)
+			matches <- variantsCount
+			wg.Done()
+		}(line, i)
+	}
+
+	num := 0
+	for match := range matches {
+		num += 1
+		result += match
+		log.Printf("%d. intermediate: %d\n", num, result)
+		fmt.Printf("%d\n", result)
+	}
+
+	end := time.Now()
+
+	diff := end.Sub(start)
+	log.Printf("> calculated for %s", diff.String())
+
+	return result
+}
+
+func myRepeat(line, sep string, amount int) string {
+	acc := ""
+	for i := 0; i < amount; i++ {
+		acc += sep
+		acc += line
+	}
+	acc, _ = strings.CutPrefix(acc, sep)
+
+	return acc
+}
+
+// ???.### 1,1,3
+func ReadLine(line string) (string, []int) {
+	firstSplit := strings.Split(line, " ")
+	if len(firstSplit) != 2 {
+		panic(fmt.Sprintf("error splitting %s into 2", line))
+	}
+	mask := firstSplit[0]
+	mask = myRepeat(mask, "?", 5)
+	blocks := firstSplit[1]
+	blocks = myRepeat(blocks, ",", 5)
+	// log.Printf(">> repeating blocks %s", blocks)
+	blockLengthStrings := strings.Split(blocks, ",")
+	blockLengs := make([]int, len(blockLengthStrings))
+
+	for i, blockLenStr := range blockLengthStrings {
+		num, err := strconv.Atoi(blockLenStr)
+		if err != nil {
+			panic(fmt.Sprintf("error extracting num %s from %s\n", blockLenStr, line))
+		}
+		blockLengs[i] = num
+	}
+
+	return mask, blockLengs
+}
+
+func generatePermutations(curString string, targetLength int, blockLengths []int, blockLengthsSum int, mask string, memo map[string]int) int {
+
+	memoKey := fmt.Sprintf("%+v|%d", blockLengths, len(curString))
+	memoized, memoFound := memo[memoKey]
+	if memoFound {
+		return memoized
+	}
+
+	// fmt.Printf("> entering with \n%s\nfor map \n%s\n\n", curString, mask)
+	// time.Sleep(time.Second)
+	if !isVariantMatchesMask(curString, mask) {
+		return 0
+	}
+
+	// log.Printf("> entering with %s\n", curString)
+	if len(blockLengths) == 0 {
+		if len(curString) > targetLength {
+			return 0
+		}
+		variant := curString + strings.Repeat(".", targetLength-len(curString))
+		if !isVariantMatchesMask(variant, mask) {
+			return 0
+		}
+		memo[memoKey] = 1
+		return 1
+	}
+
+	nextBlock := blockLengths[0]
+	restBlocks := blockLengths[1:]
+
+	if len(curString) + blockLengthsSum + len(blockLengths) - 1 > targetLength {
+		return 0
+	}
+
+	isLast := len(restBlocks) == 0
+	rightPointRepeat := 1
+	if isLast {
+		rightPointRepeat = 0
+	}
+
+	whenPass := curString + "."
+	whenAdd := curString + strings.Repeat("#", nextBlock) + strings.Repeat(".", rightPointRepeat)
+
+	passCount := generatePermutations(whenPass, targetLength, blockLengths, blockLengthsSum, mask, memo)
+	addCount := generatePermutations(whenAdd, targetLength, restBlocks, blockLengthsSum-nextBlock, mask, memo)
+
+	memo[memoKey] = passCount + addCount
+	return passCount + addCount
+}
+
+func isVariantMatchesMask(variant, mask string) bool {
+	if len(mask) < len(variant) {
+		log.Printf("mask %s is less than variant %s\n", mask, variant)
+	}
+	maskRunes := []rune(mask)
+	for i, symb := range variant {
+		if maskRunes[i] == '?' {
+			continue
+		}
+		if maskRunes[i] != symb {
+			return false
+		}
+	}
+
+	return true
+}
--- a/day12/example
+++ b/day12/example
@@ -0,0 +1,6 @@
+#.#.### 1,1,3
+.#...#....###. 1,1,3
+.#.###.#.###### 1,3,1,6
+####.#...#... 4,1,1
+#....######..#####. 1,6,5
+.###.##....# 3,2,1
--- a/day12/example1
+++ b/day12/example1
@@ -0,0 +1,6 @@
+???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1
--- a/day12/notes.org
+++ b/day12/notes.org
@@ -0,0 +1,104 @@
+#+title: Notes
+* i guess let's generate all possible? and short circuit when they are not matching mask
+how do i generate all possible?
+
+i take length of the mask, that's max size
+then for each step, either put . or put n # from the input.
+
+add to current string, and do 2 recursive calls, one with diminished 'queue', one with same
+* wrong answer on input
+it's too high
+
+and log shows:
+
+2023/12/12 15:07:52 for line ???#?.?#?#.?#???#..? blocks [4 4 5 1] matches 2
+
+and it should be 0
+** huh, nope this looks good:
+	testMask := "???#?.?#?#.?#???#..?"
+	testBlocks := []int{4,4,5,1}
+    testVariants := generatePermutations("", len(testMask), testBlocks, 14, testMask)
+	fmt.Printf("for mask %s and blocks %+v\n", testMask, testBlocks)
+	fmt.Println(testVariants)
+
+    for mask ???#?.?#?#.?#???#..? and blocks [4 4 5 1]
+[####..####..#####..# .####.####..#####..#]
+** let's check this : for line ??????#???????? blocks [7 2] matches 21
+** or this for line ?????.??#????? blocks [3 3 2 1] matches 3
+looks ok
+** this for line ??..??#?????#?##? blocks [1 1 1 1 4] matches 15
+looks good
+** for line ?#??#??#???.??.??.? blocks [1 2 3 1 1 1] matches 20
+seems ok
+** for line ???????#??.????####? blocks [1 1 1 1 1 6] matches 58
+bingo?
+
+for mask ???????#??.????####? and blocks [1 1 1 1 1 6]
+#.#.#..#.#.######...
+#.#.#..#.#..######..
+#.#.#..#.#...######.
+#.#.#..#.#....######
+#.#.#..#...#.######.
+#.#.#..#...#..######
+#.#.#..#....#.######
+#.#..#.#.#.######...
+#.#..#.#.#..######..
+#.#..#.#.#...######.
+#.#..#.#.#....######
+#.#..#.#...#.######.
+#.#..#.#...#..######
+#.#..#.#....#.######
+#.#....#.#.#.######.
+#.#....#.#.#..######
+#.#....#.#..#.######
+#..#.#.#.#.######...
+#..#.#.#.#..######..
+#..#.#.#.#...######.
+#..#.#.#.#....######
+#..#.#.#...#.######.
+#..#.#.#...#..######
+#..#.#.#....#.######
+#..#...#.#.#.######.
+#..#...#.#.#..######
+#..#...#.#..#.######
+#...#..#.#.#.######.
+#...#..#.#.#..######
+#...#..#.#..#.######
+#....#.#.#.#.######.
+#....#.#.#.#..######
+#....#.#.#..#.######
+.#.#.#.#.#.######...
+.#.#.#.#.#..######..
+.#.#.#.#.#...######.
+.#.#.#.#.#....######
+.#.#.#.#...#.######.
+.#.#.#.#...#..######
+.#.#.#.#....#.######
+.#.#...#.#.#.######.
+.#.#...#.#.#..######
+.#.#...#.#..#.######
+.#..#..#.#.#.######.
+.#..#..#.#.#..######
+.#..#..#.#..#.######
+.#...#.#.#.#.######.
+.#...#.#.#.#..######
+.#...#.#.#..#.######
+..#.#..#.#.#.######.
+..#.#..#.#.#..######
+..#.#..#.#..#.######
+..#..#.#.#.#.######.
+..#..#.#.#.#..######
+..#..#.#.#..#.######
+...#.#.#.#.#.######.
+...#.#.#.#.#..######
+...#.#.#.#..#.######
+* well, maybe overnight will calculate.
+but i guess i needed to check whether blocks are 'always' taking full width
+then i'll only need to calculate once, and then multiply
+** for example
+2023/12/12 20:40:41 699 : for line ??#?????#???.? ???#?????#???.????#?????#???.????#?????#???.????#?????#???.? blocks [3 1 2 1 3 1 2 1 3 1 2 1 3 1 2 1 3 1 2 1] matches 38294856
+
+??#?? ???#?? ?.?
+3,1,2,1 - 10+3 = 13
+
+lowest s ###.#.##.#..... - plenty of space for additional
--- a/day13/dayThirteen.go
+++ b/day13/dayThirteen.go
@@ -0,0 +1,226 @@
+package day13
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func Run() int {
+	filename := "day13/input"
+	fmt.Println("hello day 13.", filename)
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprintf("error reading file %s", filename))
+	}
+	allText := string(bytes)
+	fieldTexts := strings.Split(allText, "\n\n")
+
+	result := 0
+	for _, fieldText := range fieldTexts {
+		field := ReadField(fieldText)
+		result += Calc(field)
+	}
+
+	return result
+}
+
+func Calc(field Field) int {
+	verticals, horizontals := field.initMirrors()
+	fmt.Println(field.String())
+	fmt.Printf("field width %d and height %d\n", len(field.Symbols[0]), len(field.Symbols))
+
+	for rowNum, row := range field.Symbols {
+		for colNum, symb := range row {
+			for _, horizontalMirrorUnderCheck := range horizontals {
+				// if horizontalMirrorUnderCheck.Smaller != 4 {
+				// 	continue
+				// }
+				mirroredRow, shouldCheck := horizontalMirrorUnderCheck.reflectCoord(rowNum)
+				// log.Println("for mirror", horizontalMirrorUnderCheck.String())
+				// log.Printf("> checking row %d and mirrored %d; should %t\n", rowNum, mirroredRow, shouldCheck)
+				if shouldCheck {
+					// log.Printf("checking horizontal mirror %+v", horizontalMirrorUnderCheck)
+					// log.Printf("in should check for row %d, col %d, mirrored row %d\n", rowNum, colNum, mirroredRow)
+					mirroredSymb := field.Symbols[mirroredRow][colNum]
+					isMirrored := symb == mirroredSymb
+					if !isMirrored {
+						// log.Printf("found not mirrored : %s != %s\n", string(symb), string(mirroredSymb))
+						horizontalMirrorUnderCheck.FailedLineChecks[rowNum] += 1
+					}
+				}
+			}
+		}
+		// whole row got checked.
+		// let's mark successful line check for all that didn't fail this line check
+		for _, horizontalMirror := range horizontals {
+			_, failedCheckReported := horizontalMirror.FailedLineChecks[rowNum]
+			if !failedCheckReported {
+				horizontalMirror.SuccessfulLineChecks[rowNum] = struct{}{}
+			}
+		}
+	}
+
+	rowsAboveHorizontals := 0
+	for _, mirr := range horizontals {
+		fmt.Println("horizontal: ", mirr.String())
+		if mirr.isFullMirror() {
+			log.Printf(">> found perfect Horizontal %+v\n", mirr)
+			rowsAboveHorizontals += (mirr.Smaller + 1)
+		}
+	}
+
+	for colNum, _ := range field.Symbols[0] {
+		for rowNum, row := range field.Symbols {
+			symb := row[colNum]
+			for _, verticalMirrorUnderCheck := range verticals {
+				// if verticalMirrorUnderCheck.Smaller != 8 {
+				// 	continue
+				// }
+				mirroredCol, shouldCheck := verticalMirrorUnderCheck.reflectCoord(colNum)
+				if shouldCheck {
+					// log.Printf("checking vertical mirror %+v", verticalMirrorUnderCheck)
+					// log.Printf("in should check for row %d, col %d, mirrored col %d\n", rowNum, colNum, mirroredCol)
+					mirroredSymb := field.Symbols[rowNum][mirroredCol]
+					isMirrored := symb == mirroredSymb
+					if !isMirrored {
+						// log.Printf("found not mirrored : %s != %s\n", string(symb), string(mirroredSymb))
+						verticalMirrorUnderCheck.FailedLineChecks[colNum] += 1
+					}
+				}
+			}
+		}
+		// whole row got checked.
+		// let's mark successful line check for all that didn't fail this line check
+		for _, verticalMirror := range verticals {
+			_, failedCheckReported := verticalMirror.FailedLineChecks[colNum]
+			if !failedCheckReported {
+				verticalMirror.SuccessfulLineChecks[colNum] = struct{}{}
+			}
+		}
+	}
+	colsToLeftOfHorizontals := 0
+	for _, mirr := range verticals {
+		fmt.Println("vertical: ", mirr.String())
+		if mirr.isFullMirror() {
+			log.Printf(">> found perfect Vertical %+v\n", mirr)
+			colsToLeftOfHorizontals += (mirr.Smaller + 1)
+		}
+	}
+
+	result := colsToLeftOfHorizontals + 100*rowsAboveHorizontals
+
+	return result
+}
+
+type Field struct {
+	Symbols [][]rune
+}
+
+func ReadField(fieldText string) Field {
+	fieldText = strings.TrimSpace(fieldText)
+	lines := strings.Split(fieldText, "\n")
+
+	symbols := make([][]rune, len(lines))
+	for i, line := range lines {
+		symbols[i] = []rune(line)
+	}
+
+	return Field{
+		Symbols: symbols,
+	}
+}
+
+func (f *Field) String() string {
+	text := "\n"
+	for _, row := range f.Symbols {
+		text += string(row)
+		text += "\n"
+	}
+	return text
+}
+
+func (f *Field) initMirrors() (vertical []Mirror, horizontal []Mirror) {
+	height := len(f.Symbols)
+	width := len(f.Symbols[0])
+	amountHorizontal := height - 1
+	amountVertical := width - 1
+	horizontal = make([]Mirror, amountHorizontal)
+	vertical = make([]Mirror, amountVertical)
+
+	for rowNum := 0; rowNum < amountHorizontal; rowNum++ {
+		maxDist := min(rowNum, height - 1 - (rowNum+1))
+		// log.Println("maxDist ", maxDist, "for rowNum ", rowNum)
+		horizontal[rowNum] = Mirror{
+			Smaller:              rowNum,
+			Bigger:               rowNum + 1,
+			SuccessfulLineChecks: make(map[int]any),
+			FailedLineChecks:     make(map[int]int),
+			MaxDistToCheck:       maxDist,
+		}
+	}
+
+	for colNum := 0; colNum < amountVertical; colNum++ {
+		maxDist := min(colNum, width - 1 - (colNum+1))
+		vertical[colNum] = Mirror{
+			Smaller:              colNum,
+			Bigger:               colNum + 1,
+			SuccessfulLineChecks: make(map[int]any),
+			FailedLineChecks:     make(map[int]int),
+			MaxDistToCheck:       min(colNum, maxDist),
+		}
+	}
+
+	return
+}
+
+type Mirror struct {
+	// located between lines
+	Smaller, Bigger int
+	MaxDistToCheck  int // how many steps from mirrow have to be checked to confirm
+	// i.e if mirror between 0 and 1 - only rows 0 & 1 have to be checked, row 2 is 'mirrored' outside of the field and 'ok'
+	// value 0 means one step from 'mirror' so rows 0 and 1
+	SuccessfulLineChecks map[int]any
+	FailedLineChecks     map[int]int // from line num, to amount of errors in that line
+}
+
+func (m *Mirror)isFullMirror() bool {
+	correctFailedLinesCount := len(m.FailedLineChecks) == 2
+	if correctFailedLinesCount {
+		for failedLine, failedSymbols := range m.FailedLineChecks {
+			reflectedLine, _ := m.reflectCoord(failedLine)
+			doublyReflected, _ := m.reflectCoord(reflectedLine)
+			// log.Printf(">>>> checking failed line %d, reflected is %d; doubly %d. amount failed is %d\n", failedLine, reflectedLine, doublyReflected, failedSymbols)
+			if failedSymbols == 1 && (doublyReflected == failedLine) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func (m *Mirror)String() string {
+	return fmt.Sprintf("Mirror (full %t) between %d and %d. successful lines: %+v ; failed lines: %+v. Max check dist: %d\n",
+		m.isFullMirror(), m.Smaller, m.Bigger, m.SuccessfulLineChecks, m.FailedLineChecks, m.MaxDistToCheck)
+}
+
+func (m *Mirror) reflectCoord(coord int) (reflected int, shouldCheck bool) {
+	dist := m.Smaller - coord
+
+	// _, distConfirmed := m.SuccessfulLineChecks[dist]
+	// if distConfirmed {
+	// 	// log.Printf("> getting dist confirmed for coord %d ; dist %d\n", coord, dist)
+	// 	return 0, false // either line already fully confirmed, or failed. no need for additional checks
+	// }
+
+	reflected = m.Bigger + dist
+	if dist < 0 {
+		dist = coord - m.Bigger
+		reflected = m.Smaller - dist
+	}
+
+	shouldCheck = dist <= m.MaxDistToCheck
+
+	return reflected, shouldCheck
+}
--- a/day13/example
+++ b/day13/example
@@ -0,0 +1,15 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#
--- a/day13/example1
+++ b/day13/example1
@@ -0,0 +1,7 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
--- a/day13/example2
+++ b/day13/example2
@@ -0,0 +1,7 @@
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#
--- a/day13/example3
+++ b/day13/example3
@@ -0,0 +1,15 @@
+.#..#..
+.##.###
+..####.
+##.##.#
+#.####.
+#.#.##.
+##.##.#
+..####.
+.##.###
+.#..#..
+##.....
+#.###.#
+##.....
+##.....
+#.###.#
--- a/day13/example4
+++ b/day13/example4
@@ -0,0 +1,17 @@
+...#...####...#..
+.....##.##.##....
+##....######....#
+..#.##.#..#.##...
+##.###.####.###.#
+..###...##...###.
+#####.##..##.####
+#######....######
+###...#.##.#...##
+....###.##.###...
+##.####.##.####.#
+..###...##...###.
+##.#.##....##.#.#
+##..#.#....#.#..#
+##.###.#..#.###.#
+###.#...##...#.##
+..####.####.####.
--- a/day13/notes.org
+++ b/day13/notes.org
@@ -0,0 +1,72 @@
+#+title: Notes
+* part 2 problems
+making example 3 from first field of my input
+
+.#..#..
+.##.###
+..####.
+##.##.#
+#.####.
+#.#.##.
+##.##.#
+..####.
+.##.###
+.#..#..
+##.....
+#.###.#
+##.....
+##.....
+#.###.#
+* the mirror should be between 4 & 5
+but my output is
+horizontal:  Mirror (full false) between 4 and 5. successful lines: map[0:{} 1:{} 2:{} 3:{} 4:{} 6:{} 7:{} 8:{} 9:{} 10:{} 11:{} 12:{} 13:{} 14:{}] ; failed lines: map[5:1]. Max check dist: 4
+
+why is line 4 marked as successful?
+
+** let's turn off verticals, and only look at checks for horizontal 4
+** why do i have 'row 4, mirrored 0'?
+because of 'should check false' i guess
+** now example 3 works, but some other still don't find the mirror
+* another example
+error should be on line 2
+
+...#...####...#..
+.....##.##.##....
+##....######....#
+..#.##.#..#.##...
+##.###.####.###.#
+..###...##...###.
+#####.##..##.####
+#######....######
+###...#.##.#...##
+....###.##.###...
+##.####.##.####.#
+..###...##...###.
+##.#.##....##.#.#
+##..#.#....#.#..#
+##.###.#..#.###.#
+###.#...##...#.##
+..####.####.####.
+** deleting around (8,9)
+.....
+.....
+##..#
+..#..
+##..#
+..##.
+#####
+#####
+#####
+.....
+##..#
+..##.
+##..#
+##..#
+##..#
+#####
+..##.
+
+error should be (2, 3)
+** let's only keep vertical, with Smaller 8
+oh, there should be 'line 3, 1 error', but there also should  be 'line 2, 1 error'
+why don't we have this?
--- a/day14/dayFourteen.go
+++ b/day14/dayFourteen.go
@@ -0,0 +1,216 @@
+package day14
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func Run() int {
+	fmt.Println("hello day 14")
+
+	field := ReadPlatform("day14/input")
+	fmt.Println(field.String())
+
+	// fmt.Printf("> lines for field %+v\n", field.UpIndices())
+	// field.Move(field.Height(), field.UpIndices())
+	cycles := 1000000000
+	states := make(map[string]int)
+	// 2023/12/14 11:50:32 >>> found loop. known state after 10 equal to one after 3
+
+	var loopLen, initialStretch int
+
+	for i := 1; i <= cycles; i++ {
+		field.DoSpinCycle()
+		// fmt.Println(field.String())
+
+		stringRepr := field.String()
+		prevIter, known := states[stringRepr]
+		if known {
+			log.Printf(">>> found loop. known state after %d equal to one after %d", i, prevIter)
+			initialStretch = prevIter
+			loopLen = i - prevIter
+			break
+		}
+
+		states[stringRepr] = i
+
+		if i % 100000 == 0 {
+			log.Print("done ", i, " cycles")
+		}
+	}
+
+	// field is already in a 'loop' state.
+	// so we've already done 'initial stretch' so to make field in same state as after 'cycles'
+	// i only need to check rest of (cycles - initialStretch)
+	movesToMake := (cycles - initialStretch)%loopLen
+	log.Printf(">>> data: initial steps %d, loop len %d. to do same as %d iterations i need %d", initialStretch, loopLen, cycles, movesToMake)
+
+	for i := 1; i <= movesToMake; i++ {
+		field.DoSpinCycle()
+		// fmt.Println(field.String())
+	}
+
+	// north rock load
+	return field.NorthLoad()
+}
+
+const Rock rune = 'O'
+const Wall rune = '#'
+const Space rune = '.'
+
+type Platform struct {
+	Rocks [][]rune
+}
+
+func (p *Platform) Height() int {
+	return len(p.Rocks)
+}
+func (p *Platform) Width() int {
+	return len(p.Rocks[0])
+}
+
+func ReadPlatform(filename string) Platform {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("cannot read file: ", filename))
+	}
+	text := string(bytes)
+	text = strings.TrimSpace(text)
+	lines := strings.Split(text, "\n")
+
+	rocks := make([][]rune, len(lines))
+	for i, line := range lines {
+		rocks[i] = []rune(line)
+	}
+
+	return Platform{
+		Rocks: rocks,
+	}
+}
+
+func (p *Platform) String() string {
+	text := "\n"
+	for _, row := range p.Rocks {
+		text += string(row)
+		text += "\n"
+	}
+
+	return text
+}
+
+type Coord struct{ Row, Col int }
+
+// indices for moving UP, from down to up
+func (p *Platform) UpIndices() [][]Coord {
+	lines := make([][]Coord, 0)
+	for col := 0; col < p.Width(); col++ {
+		line := make([]Coord, 0)
+		for row := 0; row < p.Height(); row++ {
+			line = append(line, Coord{Row: row, Col: col})
+		}
+		lines = append(lines, line)
+	}
+	return lines
+}
+
+// indices for moving DOWN, from up to down
+func (p *Platform) DownIndices() [][]Coord {
+	lines := make([][]Coord, 0)
+	for col := 0; col < p.Width(); col++ {
+		line := make([]Coord, 0)
+		for row := p.Height() - 1; row >= 0; row-- {
+			line = append(line, Coord{Row: row, Col: col})
+		}
+		lines = append(lines, line)
+	}
+	return lines
+}
+
+// indices for moving RIGHT from right to left
+func (p *Platform) RightIndices() [][]Coord {
+	lines := make([][]Coord, 0)
+	for row := 0; row < p.Height(); row++ {
+		line := make([]Coord, 0)
+		for col := p.Width() - 1; col >= 0; col-- {
+			line = append(line, Coord{Row: row, Col: col})
+		}
+		lines = append(lines, line)
+	}
+	return lines
+}
+
+// indices for moving LEFT, from left to right
+func (p *Platform) LeftIndices() [][]Coord {
+	lines := make([][]Coord, 0)
+	for row := 0; row < p.Height(); row++ {
+		line := make([]Coord, 0)
+		for col := 0; col < p.Width(); col++ {
+			line = append(line, Coord{Row: row, Col: col})
+		}
+		lines = append(lines, line)
+	}
+	return lines
+}
+
+func (p *Platform) SymbAt(coord Coord) rune {
+	return p.Rocks[coord.Row][coord.Col]
+}
+func (p *Platform) SetSymbAt(coord Coord, symb rune) {
+	p.Rocks[coord.Row][coord.Col] = symb
+}
+
+func (p *Platform) Move(n int, lines [][]Coord) {
+	for _, line := range lines {
+		moveSize := 0
+		for i, coord := range line {
+			symb := p.SymbAt(coord)
+			switch symb {
+			case Space:
+				moveSize += 1
+				if moveSize > n {
+					moveSize = n
+				}
+			case Wall:
+				moveSize = 0
+			case Rock:
+				if moveSize == 0 {
+					continue
+				}
+				// get coord for moveSize back. and set that to 'o'
+				// and set current to '.'
+				// panic if that place is not '.' i guess
+				moveTo := line[i-moveSize]
+				symbAtTarget := p.SymbAt(moveTo)
+				if symbAtTarget != Space {
+					panic(fmt.Sprintf("attempting to move %+v to %+v, target symbol is %s, not '.'",
+						coord, moveTo, string(symbAtTarget)))
+				}
+				p.SetSymbAt(moveTo, Rock)
+				p.SetSymbAt(coord, Space)
+			}
+		}
+	}
+}
+
+func (p *Platform) NorthLoad() int {
+	total := 0
+	height := p.Height()
+	for i, row := range p.Rocks {
+		for _, symb := range row {
+			if symb == Rock {
+				total += (height - i)
+			}
+		}
+	}
+	return total
+}
+
+func (p *Platform) DoSpinCycle() {
+	// north, west, south, east - till the end
+	p.Move(p.Height(), p.UpIndices())
+	p.Move(p.Width(), p.LeftIndices())
+	p.Move(p.Height(), p.DownIndices())
+	p.Move(p.Width(), p.RightIndices())
+}
--- a/day14/example
+++ b/day14/example
@@ -0,0 +1,10 @@
+O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....
--- a/day15/dayFifteen.go
+++ b/day15/dayFifteen.go
@@ -0,0 +1,148 @@
+package day15
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+func Run() int {
+	fmt.Println("hello day 15")
+	log.Println("hello day 15")
+	filename := "day15/input"
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("error reading file ", filename))
+	}
+	text := string(bytes)
+	text = strings.TrimSpace(text)
+	instructions := strings.Split(text, ",")
+
+	result := 0
+
+	boxes := make([]Box, 256)
+	for i, box := range boxes {
+		box.Focals = make(map[string]int)
+		boxes[i] = box
+	}
+
+	for _, instructionStr := range instructions {
+		i := ReadInstruction(instructionStr)
+		box := boxes[i.Box]
+		box.Act(i)
+		boxes[i.Box] = box
+
+		// result += ASCIIStringHash(instruction)
+	}
+
+	for i, box := range boxes {
+		if len(box.Labels) != 0 {
+			log.Printf("%d box %+v final state\n", i, box)
+		}
+		result += (i + 1) * box.FocusingPower()
+	}
+
+	return result
+}
+
+type Box struct {
+	Labels []string
+	Focals map[string]int
+}
+
+func (b *Box)Act(i Instruction) {
+	log.Printf("for box %+v instruction \n%s\n", b, i.String())
+	switch i.Action {
+    case Put:
+		_, found := b.Focals[i.Label]
+		if !found {
+			b.Labels = append(b.Labels, i.Label)
+		}
+		b.Focals[i.Label] = i.LensFocal
+
+	case Remove:
+		_, found := b.Focals[i.Label]
+		if !found {
+			return
+		}
+		index := slices.Index(b.Labels, i.Label)
+		delete(b.Focals, i.Label)
+		b.Labels = slices.Delete(b.Labels, index, index+1)
+	}
+	log.Printf("result : %+v\n", b)
+	return
+}
+
+func (b *Box)FocusingPower() int {
+	result := 0
+	for i, label := range b.Labels {
+		result += (i + 1) * b.Focals[label]
+	}
+	return result
+}
+
+type Action rune
+
+const (
+	Put    Action = '='
+	Remove        = '-'
+)
+
+type Instruction struct {
+	Label     string
+	Box       int
+	Action    Action
+	LensFocal int
+}
+
+func (i *Instruction) String() string {
+	operation := ""
+	switch i.Action {
+	case Put:
+		operation = "put into"
+	case Remove:
+		operation = "remove from"
+	}
+	return fmt.Sprintf("%s\t\t%d of focal %d %s", operation, i.Box, i.LensFocal, i.Label)
+}
+
+func ReadInstruction(str string) Instruction {
+	result := Instruction{}
+
+	re := regexp.MustCompile(`(?P<label>\D+)(?P<operation>[=\-])(?P<focal>\d*)`)
+	// log.Println("in str ", str)
+	fields := re.FindStringSubmatch(str)
+	// log.Printf("in %s found %+v", str, fields)
+
+	operation := fields[2]
+	operationRune := []rune(operation)[0]
+	result.Action = Action(operationRune)
+
+	if operationRune == '=' {
+		focalStr := fields[3]
+		focal, err := strconv.Atoi(focalStr)
+		if err != nil {
+			panic(fmt.Sprint("error reading focal from ", str))
+		}
+		result.LensFocal = focal
+	}
+
+	result.Label = fields[1]
+	result.Box = ASCIIStringHash(result.Label)
+
+	return result
+}
+
+func ASCIIStringHash(str string) int {
+	result := 0
+	for _, symb := range str {
+		result += int(symb)
+		result *= 17
+		result %= 256
+	}
+	return result
+}
--- a/day15/example
+++ b/day15/example
@@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7
--- a/day16/example
+++ b/day16/example
@@ -0,0 +1,10 @@
+.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|....
--- a/day16/floorWillBeLava.go
+++ b/day16/floorWillBeLava.go
@@ -0,0 +1,306 @@
+package day16
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"os"
+	"strings"
+	"sync"
+)
+
+func Run() int {
+	fmt.Println("hello from day 16")
+	log.Println("starting")
+	filename := "day16/input"
+	field := ReadField(filename)
+	startPoints := StartPoints(&field)
+
+	var startPointsWaitGroup sync.WaitGroup
+	startPointsWaitGroup.Add(len(startPoints))
+
+	results := make(chan int)
+
+	go func() {
+		startPointsWaitGroup.Wait()
+		close(results)
+	}()
+
+	for _, start := range startPoints {
+		go func(start MovementPoint) {
+			cleanField := ReadField(filename)
+			cleanField.StartTraversal(start)
+			thisResult := cleanField.CountEnergized()
+			results <- thisResult
+			startPointsWaitGroup.Done()
+		}(start)
+	}
+
+	max := math.MinInt
+	for energized := range results {
+		if energized > max {
+			max = energized
+			log.Println("found new max: ", max)
+		}
+	}
+
+	// fmt.Println(field.String())
+	// field.StartTraversal()
+
+	// fmt.Println(field.ShowEnergyzed())
+
+	return max
+}
+
+func StartPoints(f *Field) []MovementPoint {
+	result := make([]MovementPoint, 0)
+
+	for rowNum, row := range f.cells {
+		result = append(result,
+			MovementPoint{Row: rowNum, Col: 0, Direction: Rightward},
+			MovementPoint{Row: rowNum, Col: len(row) - 1, Direction: Leftward})
+	}
+
+	for colNum, _ := range f.cells[0] {
+		result = append(result,
+			MovementPoint{Row: 0, Col: colNum, Direction: Downward},
+			MovementPoint{Row: len(f.cells) - 1, Col: colNum, Direction: Upward})
+
+	}
+
+	return result
+}
+
+// have shared field
+// running traversal recursive function per ray
+// exit if going out of field or visiting cell that already had light in this direction
+// (i.e encountering loop)
+
+type CellType rune
+
+const (
+	Empty           CellType = '.'
+	SplitterNS               = '|'
+	SplitterEW               = '-'
+	MirrorBackslash          = '\\'
+	MirrorSlash              = '/'
+)
+
+type Direction int
+
+const (
+	Upward Direction = iota
+	Downward
+	Leftward
+	Rightward
+)
+
+type Cell struct {
+	CellType   CellType
+	KnownBeams map[Direction]any
+}
+
+type Field struct {
+	cells [][]*Cell
+}
+
+func (f *Field) isValid(mp MovementPoint) bool {
+	if mp.Row < 0 || mp.Col < 0 {
+		return false
+	}
+	if mp.Row >= len(f.cells) || len(f.cells) == 0 || mp.Col >= len(f.cells[0]) {
+		return false
+	}
+	return true
+}
+
+func ReadField(filename string) Field {
+	result := Field{}
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("cannot read file: ", filename))
+	}
+	text := string(bytes)
+	text = strings.TrimSpace(text)
+	for _, line := range strings.Split(text, "\n") {
+		rowCells := make([]*Cell, 0)
+		for _, symb := range line {
+			rowCells = append(rowCells, &Cell{
+				CellType:   CellType(symb),
+				KnownBeams: make(map[Direction]any),
+			})
+		}
+		result.cells = append(result.cells, rowCells)
+	}
+	return result
+}
+
+func (f *Field) String() string {
+	result := "\n"
+	for _, row := range f.cells {
+		for _, cell := range row {
+			result += string(cell.CellType)
+		}
+		result += "\n"
+	}
+	return result
+}
+
+func (f *Field) ShowEnergyzed() string {
+	result := "\n"
+	for _, row := range f.cells {
+		for _, cell := range row {
+			if len(cell.KnownBeams) > 0 {
+				result += "#"
+			} else {
+				result += string(cell.CellType)
+			}
+
+		}
+		result += "\n"
+	}
+	return result
+
+}
+
+type MovementPoint struct {
+	Row, Col  int
+	Direction Direction
+}
+
+func (f *Field) StartTraversal(startPoint MovementPoint) {
+	reportedVisits := make(chan MovementPoint)
+	var wg sync.WaitGroup
+
+	go f.RecordVisits(reportedVisits)
+	wg.Add(1)
+	go f.TraverseFrom(startPoint, reportedVisits, &wg)
+
+	wg.Wait()
+	close(reportedVisits)
+}
+
+func (f *Field) CountEnergized() (result int) {
+	for _, row := range f.cells {
+		for _, cell := range row {
+			if len(cell.KnownBeams) > 0 {
+				result += 1
+			}
+		}
+	}
+	return
+}
+
+func (f *Field) RecordVisits(reportedPoints <-chan MovementPoint) {
+	for point := range reportedPoints {
+		cell := f.cells[point.Row][point.Col]
+		// log.Printf("recording visit %+v to %+v at row %d col %d\n", point, cell, point.Row, point.Col)
+		cell.KnownBeams[point.Direction] = struct{}{}
+	}
+}
+
+// starting at point, mark as visited
+// move (concurrently if required) into next points
+// ends - when out of the field, or if encountering a cycle
+func (f *Field) TraverseFrom(current MovementPoint, reportVisits chan<- MovementPoint, wg *sync.WaitGroup) {
+	// log.Printf("> starting traverse through %+v", current)
+	if !f.isValid(current) {
+		log.Println("invalid current ", current, " should be impossible")
+		wg.Done()
+		return
+	}
+	cell := f.cells[current.Row][current.Col]
+	_, knownDirection := cell.KnownBeams[current.Direction]
+	if knownDirection {
+		// log.Printf("found cycle at %+v in %+v", current, cell)
+		wg.Done()
+		return
+	}
+
+	reportVisits <- current
+
+	nextPoints := NextPoints(f, current)
+	// log.Printf("for current %+v next are: %+v\n", current, nextPoints)
+	switch len(nextPoints) {
+	case 0:
+		wg.Done()
+		return
+	case 1:
+		f.TraverseFrom(nextPoints[0], reportVisits, wg)
+		return
+	case 2:
+		wg.Add(1)
+		go f.TraverseFrom(nextPoints[0], reportVisits, wg)
+		f.TraverseFrom(nextPoints[1], reportVisits, wg)
+		return
+	}
+
+}
+
+func NextPoints(f *Field, current MovementPoint) []MovementPoint {
+	cell := f.cells[current.Row][current.Col]
+	nextDirections := cell.CellType.NextDirections(current.Direction)
+	nextCells := make([]MovementPoint, 0)
+	for _, direction := range nextDirections {
+		nextMovementPoint := current.ApplyDirection(direction)
+		if f.isValid(nextMovementPoint) {
+			nextCells = append(nextCells, nextMovementPoint)
+		}
+	}
+	return nextCells
+}
+
+// value receiver, can safely modify incoming mp
+// doesn't know about Field dimentions
+func (mp MovementPoint) ApplyDirection(d Direction) MovementPoint {
+	switch d {
+	case Upward:
+		mp.Row -= 1
+	case Downward:
+		mp.Row += 1
+	case Leftward:
+		mp.Col -= 1
+	case Rightward:
+		mp.Col += 1
+	}
+	mp.Direction = d
+	return mp
+}
+
+func (ct CellType) NextDirections(currentDirection Direction) (nextDirections []Direction) {
+	switch ct {
+	case Empty:
+		nextDirections = []Direction{currentDirection}
+	case SplitterNS:
+		if currentDirection == Rightward || currentDirection == Leftward {
+			nextDirections = []Direction{Upward, Downward}
+		} else {
+			nextDirections = []Direction{currentDirection}
+		}
+	case SplitterEW:
+		if currentDirection == Downward || currentDirection == Upward {
+			nextDirections = []Direction{Leftward, Rightward}
+		} else {
+			nextDirections = []Direction{currentDirection}
+		}
+	case MirrorBackslash:
+		// mirror symbol is \
+		directionMappings := map[Direction]Direction{
+			Leftward:  Upward,
+			Rightward: Downward,
+			Upward:    Leftward,
+			Downward:  Rightward,
+		}
+		nextDirections = []Direction{directionMappings[currentDirection]}
+	case MirrorSlash:
+		// mirrow symbol is /
+		directionMappings := map[Direction]Direction{
+			Leftward:  Downward,
+			Rightward: Upward,
+			Upward:    Rightward,
+			Downward:  Leftward,
+		}
+		nextDirections = []Direction{directionMappings[currentDirection]}
+	}
+	return
+}
--- a/day17/clumsyCrucible.go
+++ b/day17/clumsyCrucible.go
@@ -0,0 +1,321 @@
+package day17
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"os"
+	"slices"
+	"strings"
+)
+
+func Run() int {
+	fmt.Println("hello from day 17")
+	filename := "day17/input"
+	field := NewField(filename)
+	log.Printf("%+v\n", field)
+
+	field.RunDijkstra()
+
+	lenToEnd := field.Paths[field.Finish].totalLength
+	fmt.Println("check visually:")
+	// fmt.Println(field.Paths[end].stringPathSoFar)
+	fmt.Println(field.Paths[field.Finish].stringPathSoFar)
+	return lenToEnd
+}
+
+// let's do dijkstra. it also needs a priority queue
+
+// priority queue would be over vertice. and would have to have enough information to
+// calc the distance from neighbors.
+// how to check condition of max 3 in one row?
+// with each vertice store [horizontal:n|vertical:n] and if it's 3 just dont consider?
+
+// so in iteration, i have some vertice, with horizontal:2 for example,
+// i check all neighbors, if path through 'this' is shorter, set that as path,
+// but also mark the path with len of straight.
+//
+// so priority queue is with 'path to next'
+// or rather 'path to i,j'
+// then check for neighbors (non finished), calc distance to them through this
+// 	checking neighbors via 'path get directions' 'path get geighbors from directions'
+// if shorter - update
+// mark current as 'finished'
+// so, i'll be checking cost to enter directly from this table,
+// but check path len
+
+func ReadEnterCosts(filename string) [][]int {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("error reading file ", filename))
+	}
+	text := strings.TrimSpace(string(bytes))
+	result := make([][]int, 0)
+	for _, line := range strings.Split(text, "\n") {
+		numbers := make([]int, 0)
+		for _, digit := range line {
+			num := int(digit - '0')
+			numbers = append(numbers, num)
+		}
+		result = append(result, numbers)
+	}
+	return result
+}
+
+type Coord struct {
+	Row, Col int
+}
+
+func (c Coord) applyDirection(d Direction) (result Coord) {
+	result = c
+	switch d {
+	case Upward:
+		result.Row -= 1
+	case Downward:
+		result.Row += 1
+	case Leftward:
+		result.Col -= 1
+	case Rightward:
+		result.Col += 1
+	}
+	return
+}
+func (c Coord)String() string {
+	return fmt.Sprintf("(%d,%d)", c.Row, c.Col)
+}
+
+type Direction int
+
+const (
+	Upward Direction = iota
+	Downward
+	Leftward
+	Rightward
+)
+
+func (d Direction) String() string {
+	strings := []string{"Up", "Down", "Left", "Right"}
+	return strings[d]
+}
+
+func (d Direction) AsSymbol() string {
+	strings := []string{"^", "v", "<", ">"}
+	return strings[d]
+}
+
+func (d Direction) GetPerpendicular() (directions []Direction) {
+	switch d {
+	case Upward:
+		directions = []Direction{Leftward, Rightward}
+	case Downward:
+		directions = []Direction{Leftward, Rightward}
+	case Leftward:
+		directions = []Direction{Upward, Downward}
+	case Rightward:
+		directions = []Direction{Upward, Downward}
+	}
+	return
+}
+
+type PathSegmentEnd struct {
+	endsAt 			Coord
+	totalLength     int
+	lastSteps       map[Direction]int
+	lastDirection   Direction
+	stringPathSoFar string
+	done            bool
+}
+
+func (p *PathSegmentEnd) NextDirections2() (next []Direction) {
+	// last steps of 2 is max allowed 3 tiles in row
+	lastSteps := p.lastSteps[p.lastDirection]
+
+	if lastSteps < 4 {
+		return []Direction{p.lastDirection}
+	}
+
+	next = append(next, p.lastDirection.GetPerpendicular()...)
+
+	if lastSteps < 10 {
+		next = append(next, p.lastDirection)
+	}
+
+	// log.Printf("getting directions from %+v they are %+v", p, next)
+	return
+}
+
+func (p *PathSegmentEnd) NextDirections() (next []Direction) {
+	next = append(next, p.lastDirection.GetPerpendicular()...)
+
+	// last steps of 2 is max allowed 3 tiles in row
+	lastSteps := p.lastSteps[p.lastDirection]
+	if lastSteps < 3 {
+		next = append(next, p.lastDirection)
+	}
+
+	// log.Printf("getting directions from %+v they are %+v", p, next)
+	return
+}
+
+type Field struct {
+	Paths         map[Coord]*PathSegmentEnd
+	Costs         [][]int
+	Height, Width int
+	Start         Coord
+	Finish 	      Coord
+}
+
+func NewField(filename string) Field {
+	enterCosts := ReadEnterCosts(filename)
+	startSegment := PathSegmentEnd{
+		endsAt: Coord{0, 0},
+		totalLength:   0,
+		lastSteps:     make(map[Direction]int),
+		done:          true,
+		lastDirection: Downward, // fake, need to init direct neighbors also
+	}
+	initialPaths := make(map[Coord]*PathSegmentEnd)
+	initialPaths[Coord{0, 0}] = &startSegment
+	height := len(enterCosts)
+	width := len(enterCosts[0])
+
+	return Field{
+		Paths:  initialPaths,
+		Costs:  enterCosts,
+		Height: height,
+		Width:  width,
+		Start:  Coord{0, 0},
+		Finish: Coord{height - 1, width - 1},
+	}
+}
+
+func (f *Field) isValid(c Coord) bool {
+	return c.Col >= 0 && c.Row >= 0 && c.Row < f.Height && c.Col < f.Width
+}
+
+// presupposes that direction is valid
+func (f *Field) continuePathInDirection(curPath PathSegmentEnd, d Direction) (result PathSegmentEnd) {
+	// curPath := f.Paths[from]
+	from := curPath.endsAt
+	nextCoord := from.applyDirection(d)
+	moveCost := f.Costs[nextCoord.Row][nextCoord.Col]
+	newCost := curPath.totalLength + moveCost
+	lastSteps := make(map[Direction]int)
+
+	curPathStepsIntoThisDirection, found := curPath.lastSteps[d]
+	if !found {
+		lastSteps[d] = 1
+	} else {
+		lastSteps[d] = curPathStepsIntoThisDirection + 1
+	}
+
+	return PathSegmentEnd{
+		endsAt: nextCoord,
+		totalLength:   newCost,
+		lastDirection: d,
+		lastSteps:     lastSteps,
+		stringPathSoFar: curPath.stringPathSoFar + d.AsSymbol(),
+	}
+}
+
+func (p *PathSegmentEnd)StringKey() string {
+	return fmt.Sprintf("%s from %s with len %+v", p.endsAt.String(), p.lastDirection, p.lastSteps)
+}
+
+func (f *Field) RunDijkstra() {
+	checking := make([]PathSegmentEnd, 0)
+	distancesMap := make(map[string]int, 0)
+
+	startingPath := f.Paths[f.Start]
+	anotherStartingPath := PathSegmentEnd{
+		endsAt: Coord{0, 0},
+		totalLength:   0,
+		lastSteps:     make(map[Direction]int),
+		done:          true,
+		lastDirection: Rightward, // fake, need to init direct neighbors also
+		stringPathSoFar: ".",
+	}
+
+	checking = append(checking, *startingPath, anotherStartingPath)
+
+	distancesMap[startingPath.StringKey()] = 0
+	distancesMap[anotherStartingPath.StringKey()] = 0
+
+	for len(checking) > 0 {
+		var currentPath PathSegmentEnd
+		selectingMinDistanceOfVisited := math.MaxInt
+		for _, path := range checking {
+			if path.totalLength < selectingMinDistanceOfVisited {
+				currentPath = path
+				selectingMinDistanceOfVisited = path.totalLength
+			}
+		}
+		currentCoord := currentPath.endsAt
+		directions := currentPath.NextDirections2()
+		// fmt.Printf("> one more iteration for %+v ; directions will check %+v\n", currentPath, directions)
+
+		for _, direction := range directions {
+			neighborCoord := currentCoord.applyDirection(direction)
+			if !f.isValid(neighborCoord) {
+				continue // prevent going off the grid
+			}
+			// fmt.Printf("from %+v will examine in direction %s to %+v %+v\n", currentCoord, direction, neighborCoord, currentPath)
+			neighborPathSoFar, found := f.Paths[neighborCoord]
+			if !found {
+				neighborPathSoFar = &PathSegmentEnd{
+					totalLength: math.MaxInt,
+				}
+				f.Paths[neighborCoord] = neighborPathSoFar
+			}
+
+			pathIfWeGoFromCurrent := f.continuePathInDirection(currentPath, direction)
+			if pathIfWeGoFromCurrent.endsAt == f.Finish {
+				if pathIfWeGoFromCurrent.lastSteps[pathIfWeGoFromCurrent.lastDirection] < 4 {
+					continue
+				}
+			}
+
+			distFromThatSide, isKnown := distancesMap[pathIfWeGoFromCurrent.StringKey()]
+			if !isKnown {
+				distancesMap[pathIfWeGoFromCurrent.StringKey()] = pathIfWeGoFromCurrent.totalLength
+				// log.Printf("not known for %s \n", pathIfWeGoFromCurrent.StringKey())
+				checking = append(checking, pathIfWeGoFromCurrent)
+			}
+			if pathIfWeGoFromCurrent.totalLength < distFromThatSide {
+				f.Paths[neighborCoord] = &pathIfWeGoFromCurrent
+				// log.Printf("got update for %s \n", pathIfWeGoFromCurrent.StringKey())
+				distancesMap[pathIfWeGoFromCurrent.StringKey()] = pathIfWeGoFromCurrent.totalLength
+				checking = append(checking, pathIfWeGoFromCurrent)
+			} else {
+				continue // this path is better than existing 
+			}
+		}
+		// f.Paths[currentCoord].done = true
+		checking = slices.DeleteFunc(checking, func (other PathSegmentEnd) bool { return other.stringPathSoFar == currentPath.stringPathSoFar })
+		storedPath, found := f.Paths[currentCoord]
+		if !found || storedPath.totalLength > currentPath.totalLength {
+			f.Paths[currentCoord] = &currentPath
+		}
+		// time.Sleep(time.Microsecond)
+		// fmt.Print(f.printLastDirection())
+		// time.Sleep(time.Second)
+	}
+}
+
+func (f *Field) printLastDirection() (result string) {
+	result += "\n"
+	for rowNum := 0; rowNum < f.Height; rowNum++ {
+		for colNum := 0; colNum < f.Width; colNum++ {
+			path, found := f.Paths[Coord{rowNum, colNum}]
+			if !found {
+				result += "."
+			} else {
+				result += path.lastDirection.AsSymbol()
+			}
+		}
+		result += "\n"
+	}
+	return
+}
+
+
--- a/day17/example
+++ b/day17/example
@@ -0,0 +1,13 @@
+2413432311323
+3215453535623
+3255245654254
+3446585845452
+4546657867536
+1438598798454
+4457876987766
+3637877979653
+4654967986887
+4564679986453
+1224686865563
+2546548887735
+4322674655533
--- a/day17/example2
+++ b/day17/example2
@@ -0,0 +1,5 @@
+111111111111
+999999999991
+999999999991
+999999999991
+999999999991
--- a/day17/notes.org
+++ b/day17/notes.org
@@ -0,0 +1,10 @@
+#+title: Notes
+* so, just traversal doesn' work,
+and it's easy to imagine why.
+my guess is that i really should put 'paths to explore' into priority queue
+
+and select new ones not only by their length, but also by how far they go from the goal
+
+* lot's of time for no result
+* so, for 'dijksra' don't store set of vertices,
+but of ways we've entered them
--- a/day18/example
+++ b/day18/example
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
--- a/day18/example2
+++ b/day18/example2
@@ -0,0 +1,8 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+U 2 (#d2c081)
+L 2 (#59c680)
+D 2 (#411b91)
+L 2 (#8ceee2)
+U 5 (#d2c081)
--- a/day18/lagoon.go
+++ b/day18/lagoon.go
@@ -0,0 +1,538 @@
+package day18
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"slices"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+func Run() int {
+	log.Println("hello day 18")
+	log.Println("problem of lagoon bgins")
+	filename := "day18/input"
+	instructions := ReadInstructionas2(filename)
+	h, w := calcHeightWidth(instructions)
+	log.Printf("read %+v instructions", instructions)
+
+	field := CreateField(h, w)
+
+	// fmt.Println(field.String())
+	borderAmount := field.digByInstructions(instructions)
+	// log.Println(">>> created field", field.BordersFromLeft)
+
+	// fmt.Println(field.String())
+	// WriteToFile("borders.txt", field.String())
+	// convert -size 3000x6000 xc:white -font "FreeMono" -pointsize 13 -fill black -draw @borders.txt borders.png
+
+	log.Printf("starting dig inside for cols %d-%d and rows %d-%d ", field.MinCol, field.MaxCol, field.MinRow, field.MaxRow)
+	insideAmount := field.digInsides()
+
+	log.Printf("border is %d; inside is %d", borderAmount, insideAmount)
+	// fmt.Println(field.String())
+	// fmt.Println(field.Height, field.Width)
+	// WriteToFile("fulldug.txt", field.String())
+	// convert -size 3000x6000 xc:white -font "FreeMono" -pointsize 13 -fill black -draw @fulldug.txt fulldug.png
+
+	//  field.countDugOut()
+	return borderAmount + insideAmount
+}
+
+// determine size of field. max(sum(up), sum(down)) for height,
+// same for left and right,
+// translate (0,0) into center of the field
+//
+// have cells, with coord. and i guess four sides, with color.
+// i guess have directions, map[direction]color
+// and have 'opposite' on directoin.
+// for each direction apply it to cell coord, get cell, get opposite directoin and color it
+//
+// then have method on field and cell that excavates cell and colors all neighbors
+//
+// last part is filling in isides, should be ok with horizontal scans from left by even crossings
+
+type Direction int
+
+const (
+	Upward Direction = iota
+	Downward
+	Leftward
+	Rightward
+)
+
+func (d Direction) opposite() Direction {
+	switch d {
+	case Upward:
+		return Downward
+	case Downward:
+		return Upward
+	case Leftward:
+		return Rightward
+	case Rightward:
+		return Leftward
+	}
+	panic("unaccounted direction")
+}
+
+var DirectionNames []string = []string{"U", "D", "L", "R"}
+
+func (d Direction) String() string {
+	return DirectionNames[d]
+}
+func DirectionFromString(s string) Direction {
+	index := slices.Index(DirectionNames, s)
+	if index == -1 {
+		panic(fmt.Sprint("bad direction", s))
+	}
+	return Direction(index)
+}
+
+type Instruction struct {
+	Direction Direction
+	Steps     int
+	Color     string
+}
+
+func ReadInstructionas(filename string) (result []Instruction) {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("error reading file: ", filename))
+	}
+	text := strings.TrimSpace(string(bytes))
+	for _, line := range strings.Split(text, "\n") {
+		result = append(result, ReadInstruction(line))
+	}
+
+	return
+}
+
+func ReadInstruction(line string) Instruction {
+	fields := strings.Fields(line)
+	direction := DirectionFromString(fields[0])
+	steps, err := strconv.Atoi(fields[1])
+	if err != nil {
+		panic(fmt.Sprint("bad steps in line: ", line))
+	}
+	color := fields[2][1 : len(fields[2])-1]
+
+	return Instruction{Direction: direction, Steps: steps, Color: color}
+}
+
+func ReadInstructionas2(filename string) (result []Instruction) {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("error reading file: ", filename))
+	}
+	text := strings.TrimSpace(string(bytes))
+	for _, line := range strings.Split(text, "\n") {
+		result = append(result, ReadInstruction2(line))
+	}
+
+	return
+}
+
+func ReadInstruction2(line string) Instruction {
+	fields := strings.Fields(line)
+
+	hexDist := fields[2][2 : len(fields[2])-2]
+	hexDirection := fields[2][len(fields[2])-2 : len(fields[2])-1]
+	var direction Direction
+	switch hexDirection {
+	case "0":
+		direction = Rightward
+	case "1":
+		direction = Downward
+	case "2":
+		direction = Leftward
+	case "3":
+		direction = Upward
+	}
+
+	dist, err := strconv.ParseUint(hexDist, 16, 64)
+	if err != nil {
+		panic(err)
+	}
+
+	return Instruction{
+		Steps:     int(dist),
+		Direction: direction,
+	}
+}
+
+func calcHeightWidth(instructions []Instruction) (height, width int) {
+	movements := make(map[Direction]int)
+	for _, instr := range instructions {
+		movements[instr.Direction] += instr.Steps
+	}
+	if movements[Downward] > movements[Upward] {
+		height = 2 * movements[Downward]
+	} else {
+		height = 2 * movements[Upward]
+	}
+
+	if movements[Leftward] > movements[Rightward] {
+		width = 2 * movements[Leftward]
+	} else {
+		width = 2 * movements[Rightward]
+	}
+
+	height += 10
+	width += 10
+
+	return
+}
+
+type Coord struct {
+	Col, Row int
+}
+
+func (c Coord) applyDirection(d Direction) Coord {
+	switch d {
+	case Upward:
+		c.Row -= 1
+	case Downward:
+		c.Row += 1
+	case Leftward:
+		c.Col -= 1
+	case Rightward:
+		c.Col += 1
+	}
+
+	return c
+}
+
+type Cell struct {
+	IsDug   bool
+	ToBeDug bool
+	Coord   Coord
+}
+
+type BorderSymbol rune
+
+// ” always left to right
+const (
+	Vertical BorderSymbol = '|'
+	ToDown   BorderSymbol = '7'
+	ToUp     BorderSymbol = 'J'
+	FromUp   BorderSymbol = 'F'
+	FromDown BorderSymbol = 'L'
+)
+
+type Field struct {
+	Height, Width int
+	// Cells         [][]*Cell
+	Cells                          map[Coord]*Cell
+	MinRow, MaxRow, MinCol, MaxCol int
+	BordersFromLeft                map[int]map[int]BorderSymbol
+}
+
+func (f *Field) confirmCoord(c Coord) {
+	// log.Printf("configming coord %+v", c)
+
+	if c.Row-3 < f.MinRow {
+		f.MinRow = c.Row - 3
+	}
+	if c.Row+3 > f.MaxRow {
+		f.MaxRow = c.Row + 3
+	}
+	if c.Col-3 < f.MinCol {
+		f.MinCol = c.Col - 3
+	}
+	if c.Col+3 > f.MaxCol {
+		f.MaxCol = c.Col + 3
+	}
+}
+
+func CreateField(height, width int) Field {
+	return Field{
+		Height: height, Width: width,
+		Cells:           make(map[Coord]*Cell),
+		BordersFromLeft: make(map[int]map[int]BorderSymbol),
+	}
+}
+
+func PutSymbIntoMMMMap(mmmap map[int]map[int]BorderSymbol, row, col int, symb BorderSymbol) {
+	rowMap := mmmap[row]
+	if rowMap == nil {
+		rowMap = make(map[int]BorderSymbol)
+		mmmap[row] = rowMap
+	}
+	rowMap[col] = symb
+}
+
+func (f *Field) digByInstructions(instructions []Instruction) (borderAmount int) {
+	// for the last turn
+	instructions = append(instructions, instructions[0])
+	// but also don't overcount the border
+	borderAmount -= instructions[0].Steps
+
+	runnerCoord := Coord{Col: 0, Row: 0}
+	// f.Cells[runnerCoord] = &Cell{
+	// 	IsDug: true,
+	// }
+	// f.confirmCoord(runnerCoord) // should be confirmed when the cycle is closed on last step
+	// borderAmount += 1
+
+	var prevInstruction Instruction
+	firstInstruction := true
+	for _, instruction := range instructions {
+		log.Printf("starting new instruction %+v", instruction)
+		if !firstInstruction {
+			turn := getTurnAsIfGoingFromLeft(prevInstruction.Direction, instruction.Direction)
+			for _, theTurn := range turn {
+				// log.Printf(">> putting turn %s", string(turn))
+				PutSymbIntoMMMMap(f.BordersFromLeft, runnerCoord.Row, runnerCoord.Col, theTurn)
+			}
+		}
+		firstInstruction = false
+		// log.Printf("starting instruction %+v", instruction)
+		for i := 0; i < instruction.Steps; i++ {
+			runnerCoord = runnerCoord.applyDirection(instruction.Direction)
+			// f.Cells[runnerCoord] = &Cell{
+			// 	IsDug: true,
+			// }
+			f.confirmCoord(runnerCoord)
+			borderAmount += 1
+			// log.Printf("inside %+v updated border amount to %d", instruction, borderAmount)
+
+			if instruction.Direction == Upward || instruction.Direction == Downward {
+				_, alreadyCountedTurn := f.BordersFromLeft[runnerCoord.Row][runnerCoord.Col]
+				if !alreadyCountedTurn {
+					PutSymbIntoMMMMap(f.BordersFromLeft, runnerCoord.Row, runnerCoord.Col, Vertical)
+				}
+			}
+
+		}
+		prevInstruction = instruction
+	}
+	return
+}
+
+func getTurnAsIfGoingFromLeft(directionFrom, directionTo Direction) []BorderSymbol {
+	// log.Printf("getTurnAsIfGoingFromLeft from %s to %s", directionFrom.String(), directionTo.String())
+
+	var symbol BorderSymbol
+	if directionTo == Rightward && directionFrom == Upward {
+		symbol = FromUp
+	}
+	if directionTo == Rightward && directionFrom == Downward {
+		symbol = FromDown
+	}
+	if directionTo == Leftward && directionFrom == Upward {
+		symbol = ToDown
+	}
+	if directionTo == Leftward && directionFrom == Downward {
+		symbol = ToUp
+	}
+
+	if directionFrom == Rightward && directionTo == Upward {
+		symbol = ToUp
+	}
+	if directionFrom == Rightward && directionTo == Downward {
+		symbol = ToDown
+	}
+	if directionFrom == Leftward && directionTo == Upward {
+		symbol = FromDown
+	}
+	if directionFrom == Leftward && directionTo == Downward {
+		symbol = FromUp
+	}
+
+	// panic(fmt.Sprint("got strange from %s to %s", directionFrom.String(), directionTo.String()))
+	return []BorderSymbol{symbol}
+}
+
+func (f *Field) String() string {
+	s := "text 15,15 \""
+
+	for row := f.MinRow; row <= f.MaxRow; row++ {
+		rowChars := make([]rune, f.MaxCol-f.MinCol+1)
+		for col := f.MinCol; col <= f.MaxCol; col++ {
+
+			rowBords := f.BordersFromLeft[row]
+			if rowBords != nil {
+				bord, exists := rowBords[col]
+				if exists {
+					rowChars[col-f.MinCol] = rune(bord)
+					continue
+				}
+			}
+			cell := f.Cells[Coord{col, row}]
+			if cell != nil && cell.ToBeDug {
+				rowChars[col-f.MinCol] = '@'
+				continue
+			}
+
+			if f.isCellDug(row, col) {
+				rowChars[col-f.MinCol] = '#'
+			} else {
+				rowChars[col-f.MinCol] = '.'
+			}
+		}
+
+		s += string(rowChars)
+		s += "\n"
+	}
+	s += "\""
+	return s
+}
+func (f *Field) digInsides() (result int) {
+	lineSum := make(chan int)
+
+	var wg sync.WaitGroup
+	rowsCount := f.MaxRow - f.MinRow
+	wg.Add(rowsCount)
+
+	done := make(chan bool)
+
+	go func() {
+		wg.Wait()
+		close(lineSum)
+	}()
+
+	go func() {
+		for rowInternalCount := range lineSum {
+			result += rowInternalCount
+		}
+		close(done)
+	}()
+
+	for row := f.MinRow; row < f.MaxRow; row++ {
+		go func(row int){
+			if row%10000 == 0 {
+				log.Printf("processed rows %d out of %d", row, f.MaxRow)
+			}
+			specialBorders := f.BordersFromLeft[row]
+			if len(specialBorders) == 0 {
+				wg.Done()
+				return
+			}
+			type BorderItem struct {
+				border BorderSymbol
+				col    int
+			}
+			rowBorders := make([]BorderItem, 0)
+			for col, borderSymbol := range specialBorders {
+				rowBorders = append(rowBorders, BorderItem{borderSymbol, col})
+			}
+			slices.SortFunc(rowBorders, func(a BorderItem, b BorderItem) int {
+				return a.col - b.col
+			})
+
+			// log.Printf(">>>>>>> for row %d sorted %+v", row, rowBorders)
+			prevBorder := rowBorders[0]
+			bordersCrossed := 0
+			if prevBorder.border == Vertical {
+				bordersCrossed += 1
+			}
+			for _, specialBorder := range rowBorders[1:] {
+				diff := specialBorder.col - prevBorder.col - 1
+
+				if specialBorder.border == ToUp && prevBorder.border == FromUp {
+					bordersCrossed += 1
+					prevBorder = specialBorder
+					continue
+				}
+				if specialBorder.border == ToDown && prevBorder.border == FromDown {
+					bordersCrossed += 1
+					prevBorder = specialBorder
+					continue
+				}
+				if specialBorder.border == ToUp && prevBorder.border == FromDown {
+					prevBorder = specialBorder
+					continue
+				}
+				if specialBorder.border == ToDown && prevBorder.border == FromUp {
+					prevBorder = specialBorder
+					continue
+				}
+
+				if bordersCrossed%2 == 1 { // is in
+					for col := prevBorder.col + 1; col < specialBorder.col; col++ {
+						// f.Cells[Coord{Col: col, Row: row}] = &Cell{
+						// 	ToBeDug: true,
+						// }
+					}
+					lineSum <- diff
+					// countInside += diff
+				}
+
+				if specialBorder.border == Vertical {
+					bordersCrossed += 1
+				}
+
+				prevBorder = specialBorder
+			}
+
+			wg.Done()
+		}(row)
+	}
+
+	<-done
+
+	return result
+}
+
+// func (f *Field) digInsides() (countInside int) {
+// 	for row := f.MinRow; row < f.MaxRow; row++ {
+// 		if row % 10000 == 0 {
+// 			log.Printf("processed rows %d out of %d", row, f.MaxRow)
+// 		}
+// 		isInside := false
+// 		seenUp, seenDown := false, false // for detecting L---7 walls
+// 		for col := f.MinCol; col < f.MaxCol; col++ {
+// 			// TODO next optimization - for each row, store indices of cols with border cells
+// 			// so that count of inside would be done by many at a time
+// 			rightCellIsDug := f.isCellDug(row, col+1)
+// 			if f.isCellDug(row, col) {
+// 				upCellIsDug := f.isCellDug(row-1, col)
+// 				downCellIsDug := f.isCellDug(row+1, col)
+// 				if !rightCellIsDug {
+// 					if (upCellIsDug && seenDown) || (downCellIsDug && seenUp) {
+// 						isInside = !isInside
+// 					}
+// 					seenUp, seenDown = false, false
+// 				}
+// 			} else {
+// 				// not a dug out cell, maybe inside and needs to be dug out
+// 				if isInside {
+// 					// f.Cells[Coord{col, row}] = &Cell{
+// 					// 	ToBeDug: true,
+// 					// }
+
+// 					countInside += 1
+// 					// log.Printf("tick count inside for %d %d", row, col)
+// 					// cellPtr.ToBeDug = true
+// 				}
+// 				if rightCellIsDug {
+// 					seenUp = f.isCellDug(row-1, col+1)
+// 					seenDown = f.isCellDug(row+1, col+1)
+// 				}
+
+// 			}
+// 		}
+// 	}
+// 	return
+// }
+
+func (f *Field) isCellDug(row, col int) bool {
+	cell := f.Cells[Coord{col, row}]
+	return cell != nil && cell.IsDug
+}
+
+func WriteToFile(filename string, content string) {
+	fileBorder, err := os.Create(filename)
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		if err := fileBorder.Close(); err != nil {
+			panic(err)
+		}
+	}()
+
+	fileBorder.WriteString(content)
+}
--- a/day18/notes.org
+++ b/day18/notes.org
@@ -0,0 +1,51 @@
+#+title: Notes
+* part 2 and i'm struggling.
+maybe i need to mark 'inside' cells while i dig?
+i don't know which is 'outside' from the getgo?
+
+if i mark 'all the rightside', will that help to calculate inside?
+* well, if we dont' have instruction with steps:1 i can just count points above and belove the line
+without more complicated things
+
+just count 'seenUp' and 'seenDown' if equal - then we changed side
+
+and - we shouldn't have 'step1' because all numbers are soooo big.
+
+ok. let's do that? with maps of cols.
+** CANCELLED add map[row]map[col]any
+** CANCELLED separate method to set it up after we have all of the BorderCellCols
+** CANCELLED during digInsides on each consecutive - check above and below and count
+when there's a jump - compare counts, to make decision on whether to switch 'isInside'
+** no. just because they are long doesn't mean they won't ever get one near another
+* another idea is to save | and corners, as if we're going from left to right
+this seems reasonable.
+** DONE i guess []SpecialSymbol which has Col and Symbol
+** DONE no, let's make it map. yes will have to init, but yuck anyway
+** TODO then different logic on border building.
+if U \ D - on all but last add '|'
+on last - calc with the next turn, what should be saved 'as if traversing from the left'
+
+for L \ R - on last - calc what the turn was
+** TODO !! between last and first movement the corner is unknown.
+so, copy the first instruction to the end?
+** moment of hope.
+my calculation for example input for part 2
+day18 result: 952408144115
+
+952408144115
+*** YES.
+*** about 1M for 4 minutes
+** so, my input is ~16M rows
+3.5 seconds per 10k
+** well, maybe i can parallel.
+*** parallel example
+day18 result: 952407566854
+*** and with separate done channel from the summing goroutine
+952408144115
+**** YES
+** and
+2023/12/18 23:35:31 border is 195341588; inside is 148441957805559
+2023/12/18 23:35:31
+
+day18 result: 148442153147147
+* i should have used a formula. maybe then it would taken less than 4 hours
--- a/day19/example
+++ b/day19/example
@@ -0,0 +1,17 @@
+px{a<2006:qkq,m>2090:A,rfg}
+pv{a>1716:R,A}
+lnx{m>1548:A,A}
+rfg{s<537:gd,x>2440:R,A}
+qs{s>3448:A,lnx}
+qkq{x<1416:A,crn}
+crn{x>2662:A,R}
+in{s<1351:px,qqz}
+qqz{s>2770:qs,m<1801:hdj,R}
+gd{a>3333:R,R}
+hdj{m>838:A,pv}
+
+{x=787,m=2655,a=1222,s=2876}
+{x=1679,m=44,a=2067,s=496}
+{x=2036,m=264,a=79,s=2244}
+{x=2461,m=1339,a=466,s=291}
+{x=2127,m=1623,a=2188,s=1013}
--- a/day19/example1
+++ b/day19/example1
@@ -0,0 +1,5 @@
+in{x<4000:R,m<4000:R,A}
+px{a<4000:R,A}
+qqz{s>2770:R,m<1801:A,R}
+
+{x=787,m=2655,a=1222,s=2876}
--- a/day19/intervals.go
+++ b/day19/intervals.go
@@ -0,0 +1,57 @@
+package day19
+
+import (
+	"sort"
+)
+
+func merge(intervals [][]int) [][]int {
+    const start, end = 0, 1
+
+    var merged [][]int
+
+    if len(intervals) > 1 {
+        sort.Slice(intervals, func(i, j int) bool {
+            return intervals[i][start] < intervals[j][start]
+        })
+    }
+
+    for _, interval := range intervals {
+        last := len(merged) - 1
+        if last < 0 || interval[start] > merged[last][end] {
+            merged = append(merged,
+                []int{start: interval[start], end: interval[end]},
+            )
+        } else if interval[end] > merged[last][end] {
+            merged[last][end] = interval[end]
+        }
+    }
+
+    return merged[:len(merged):len(merged)]
+}
+
+func applyLessThan(intervals [][]int, n int) [][]int {
+	var lessers [][]int
+	for _, interval := range intervals {
+		from := interval[0]
+		if from >= n {
+			continue
+		}
+		lessers = append(lessers, []int{from, n-1})
+	}
+
+	return lessers
+}
+
+func applyMoreThan(intervals [][]int, n int) [][]int {
+	var greaters [][]int
+	for _, interval := range intervals {
+		to := interval[1]
+		if to <= n {
+			continue
+		}
+		greaters = append(greaters, []int{n+1, to})
+	}
+	// log.Printf(">>>> in applyMoreThan %d to %+v ; result %+v", n, intervals, greaters)
+
+	return greaters
+}
--- a/day19/notes.org
+++ b/day19/notes.org
@@ -0,0 +1,47 @@
+#+title: Notes
+* testing things
+
+	testSorter := day19.ReadSorterLine("qqz{s>2770:qs,m<1801:hdj,R}")
+	log.Printf("my test sorter is %+v", testSorter)
+
+	testOperation := day19.ReadOperationLine("s>2770:qs")
+	log.Println(testOperation)
+** testing simplification
+	 lnx{m>1548:A,A}
+	 qqz{s>2770:qs,m<1801:hdj,R}
+	 kt{m>2215:R,x>3386:A,x<3107:R,R}
+
+	testSorter := day19.ReadSorterLine("kt{m>2215:R,x>3386:A,x<3107:R,R}")
+	log.Printf("my test sorter is %+v", testSorter)
+
+	simplified := day19.SimplifyOperation(testSorter)
+	log.Printf("> simplivied %+v", simplified)
+* i probably don't need 'actual actors'
+just a generic function that takes 'detail' and 'sorterData'
+then applies sorterData to the detail,
+and calls itself with new sorter
+
+with special cases for "R" and "A"
+
+so. have funciton from OpeartionData & Detail -> true/false
+if true take the destination, if false, check next
+* well. only way to do this is with intervals
+
+so, sorter check takes in interval.
+
+then for each of the rule,
+call first rule with full interval,
+deduct first rule (for those that don't match) and pass to second.
+deduct second and pass to next
+
+A will return full
+R will return empty
+
+and results from each rule application should be joined
+
+so. i need interval deduction
+and i need interval join
+* found a bug in always using initial intervals to calculate 'failing' after each step
+2023/12/19 11:45:14 got and checked 167409079868000
+
+In the above example, there are 167409079868000 distinct combinations of ratings that will be accepted.
--- a/day19/sortingParts.go
+++ b/day19/sortingParts.go
@@ -0,0 +1,341 @@
+package day19
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+func Run() int {
+	fmt.Println("hello day 19. sorting parts")
+	filename := "day19/input"
+
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("cannot read file ", filename))
+	}
+
+	text := string(bytes)
+
+	split := strings.Split(text, "\n\n")
+
+	sorters := ReadSorters(split[0])
+	details := ReadDetailsPart(split[1])
+
+	log.Printf("yay, got sorters\n%+v\nand details\n%+v", sorters, details)
+
+	// countApproved := CountApprovedDetails(details, sorters)
+	result := 0
+
+	fullIntervals := AttrIntervals{
+		"x": [][]int{[]int{1, 4000}},
+		"m": [][]int{[]int{1, 4000}},
+		"a": [][]int{[]int{1, 4000}},
+		"s": [][]int{[]int{1, 4000}},
+	}
+
+	andChecked := processInterval(fullIntervals, "in", sorters)
+	log.Print("got and checked ", andChecked)
+	result = andChecked
+
+	return result
+}
+
+func CountApprovedDetails(details []DetailData, sorters map[string]SorterData) int {
+	var wg sync.WaitGroup
+	wg.Add(len(details))
+
+	approvedDetails := make(chan DetailData)
+
+	go func() {
+		wg.Wait()
+		close(approvedDetails)
+	}()
+
+	count := 0
+	acceptedScore := 0
+
+	done := make(chan any)
+
+	go func() {
+		for detail := range approvedDetails {
+			log.Println("got approved ", detail)
+			count += 1
+			for _, attrValue := range detail.Attrs {
+				acceptedScore += attrValue
+			}
+		}
+		close(done)
+	}()
+
+	for _, d := range details {
+		go func(d DetailData) {
+			log.Print("> starting for ", d)
+			isAccepted := ProcessDetail(d, sorters)
+			if isAccepted {
+				log.Println("> accepting ", d)
+				approvedDetails <- d
+			} else {
+				log.Println("> rejecting ", d)
+			}
+			wg.Done()
+		}(d)
+	}
+
+	<-done
+
+	return acceptedScore
+}
+
+type Operation rune
+
+const (
+	LessThan Operation = '<'
+	MoreThan Operation = '>'
+)
+func (o Operation)String() string {
+	return string(o)
+}
+
+type OperationData struct {
+	AttrName   string
+	Operation  Operation
+	Num        int
+	SentToName string
+	InitialString     string
+}
+func (od OperationData)String() string {
+	return od.InitialString
+}
+
+type SorterData struct {
+	Name         string
+	DefaultState string
+	Operations   []OperationData
+}
+
+func ReadSorters(sortersText string) map[string]SorterData {
+	result := make(map[string]SorterData)
+	sortersText = strings.TrimSpace(sortersText)
+	lines := strings.Split(sortersText, "\n")
+
+	for _, line := range lines {
+		sorter := SimplifyOperation( ReadSorterLine(line) )
+		result[sorter.Name] = sorter
+	}
+
+	return result
+}
+
+// qqz{s>2770:qs,m<1801:hdj,R}
+func ReadSorterLine(line string) (result SorterData) {
+	re1 := regexp.MustCompile(`(?P<NAME>\D+){(?P<OPERATIONS>.+)}`)
+
+	firstSplit := re1.FindStringSubmatch(line)
+
+	result.Name = firstSplit[1]
+
+	operationLines := strings.Split(firstSplit[2], ",")
+	operations := make([]OperationData, len(operationLines)-1)
+	result.Operations = operations
+
+	result.DefaultState = operationLines[len(operationLines)-1]
+
+	for i, line := range operationLines[:len(operationLines)-1] {
+		operations[i] = ReadOperationLine(line)
+	}
+
+	log.Printf("mathed %s got %+v; operations : %+v\n", line, firstSplit, operations)
+
+	return
+}
+
+// s>2770:qs
+func ReadOperationLine(line string) (result OperationData) {
+	result.InitialString = line
+	re := regexp.MustCompile(`(?P<ATTRNAME>\D)(?P<OPERATION>[\>\<])(?P<NUMBER>\d+):(?P<TARGET>\D+)`)
+	split := re.FindStringSubmatch(line)
+	log.Printf("matching operation %s into %+v\n", line, split)
+	result.AttrName = split[1]
+	result.Operation = Operation([]rune(split[2])[0])
+	result.SentToName = split[4]
+	num, err := strconv.Atoi(split[3])
+	if err != nil {
+		panic(fmt.Sprintf("error getting number %s in line %s. %s", split[3], line, err))
+	}
+	result.Num = num
+	return
+}
+
+// drop last operations which target same 'next' as default. these check are not necessary
+func SimplifyOperation(sorter SorterData) SorterData {
+	actualLast := len(sorter.Operations) - 1
+	for i := actualLast; i >= 0; i-- {
+		if sorter.Operations[i].SentToName != sorter.DefaultState {
+			break
+		}
+		actualLast -= 1
+	}
+
+	sorter.Operations = sorter.Operations[:actualLast+1]
+
+	return sorter
+}
+
+type DetailData struct {
+	Attrs map[string]int
+}
+
+func ReadDetailsPart(text string) (result []DetailData) {
+	text = strings.TrimSpace(text)
+	for _, line := range strings.Split(text, "\n") {
+		result = append(result, ReadDetailLine(line))
+	}
+	return
+}
+
+// {x=787,m=2655,a=1222,s=2876}
+func ReadDetailLine(line string) (result DetailData) {
+	attrs := make(map[string]int)
+	result.Attrs = attrs
+	line = line[1 : len(line)-1]
+	attrsLine := strings.Split(line, ",")
+	re := regexp.MustCompile(`(?P<ATTR>\D)=(?P<NUM>\d+)`)
+	for _, attrLine := range attrsLine {
+		split := re.FindStringSubmatch(attrLine)
+		attrName := split[1]
+		num, err := strconv.Atoi(split[2])
+		if err != nil {
+			panic(fmt.Sprint("error parsing detail ", line))
+		}
+
+		attrs[attrName] = num
+	}
+	return
+}
+
+func ProcessDetail(d DetailData, sorters map[string]SorterData) (isAccepted bool) {
+	curSorterName := "in"
+	for curSorterName != "A" && curSorterName != "R" {
+		sorter, found := sorters[curSorterName]
+		if !found {
+			panic(fmt.Sprint("error finding soter ", curSorterName))
+		}
+		curSorterName = sorter.NextSorterNameFor(d)
+	}
+	return curSorterName == "A"
+}
+
+func (s SorterData) NextSorterNameFor(d DetailData) string {
+	for _, operation := range s.Operations {
+		if operation.IsDetailPassing(d) {
+			return operation.SentToName
+		}
+	}
+
+	return s.DefaultState
+}
+
+func (o OperationData) IsDetailPassing(d DetailData) bool {
+	detailValue := d.Attrs[o.AttrName]
+	switch o.Operation {
+	case LessThan:
+		return detailValue < o.Num
+	case MoreThan:
+		return detailValue > o.Num
+	}
+
+	panic(fmt.Sprint("unknown operation. ", o, d))
+}
+
+type AttrIntervals map[string][][]int
+
+func (o OperationData) getPassingIntervals(i AttrIntervals) AttrIntervals {
+	result := make(AttrIntervals, 0)
+	for key, value := range i {
+		result[key] = value
+	}
+
+	operationKey := o.AttrName
+	operatedIntervals := result[operationKey]
+
+	switch o.Operation {
+	case LessThan:
+		result[operationKey] = applyLessThan(operatedIntervals, o.Num)
+	case MoreThan:
+		result[operationKey] = applyMoreThan(operatedIntervals, o.Num)
+	}
+
+	return result
+}
+
+func (o OperationData) getFailingIntervals(i AttrIntervals) AttrIntervals {
+	result := make(AttrIntervals, 0)
+	for key, value := range i {
+		result[key] = value
+	}
+
+	operationKey := o.AttrName
+	operatedIntervals := result[operationKey]
+
+	switch o.Operation {
+	case LessThan:
+		result[operationKey] = applyMoreThan(operatedIntervals, o.Num-1)
+	case MoreThan:
+		result[operationKey] = applyLessThan(operatedIntervals, o.Num+1)
+	}
+
+	return result
+}
+
+func  processInterval(i AttrIntervals, sorterName string, sorters map[string]SorterData) (combinationsAccepted int) {
+	if sorterName == "A" {
+		mul := 1
+		for key, attrIntervals := range i {
+			allowedValuesOfAttr := 0
+			for _, interval := range attrIntervals {
+				from := interval[0]
+				to := interval[1]
+				len := to - from + 1
+				allowedValuesOfAttr += len
+				log.Printf("for %s allowed attrs are %d", key, allowedValuesOfAttr)
+			}
+			mul *= allowedValuesOfAttr
+		}
+		log.Printf("exit recursion for %s. Accept interval %+v . result %d. max is %d", sorterName, i, mul, 40000 * 4000 * 4000 * 4000)
+		return mul
+	}
+	if sorterName == "R" {
+		return 0
+	}
+
+	s := sorters[sorterName]
+	log.Printf("> starting interval check for %s (%+v) on %+v", sorterName, s, i)
+	intervalsPassingOnThisStep := i
+
+	for _, operation := range s.Operations {
+		intervalsPassing := operation.getPassingIntervals(intervalsPassingOnThisStep)
+		log.Printf(">> %s; in operation %+v. passing are %+v", sorterName, operation, intervalsPassing)
+		ofThoseAreAccepted := processInterval(intervalsPassing, operation.SentToName, sorters)
+
+		combinationsAccepted += ofThoseAreAccepted
+		log.Printf(">> %s; results so far are %d", sorterName, combinationsAccepted)
+
+		intervalsFailingAndPassedToNextCheck := operation.getFailingIntervals(intervalsPassingOnThisStep)
+		log.Printf(">> %s; failing for the next step %+v", sorterName, intervalsFailingAndPassedToNextCheck)
+		intervalsPassingOnThisStep = intervalsFailingAndPassedToNextCheck
+	}
+
+	log.Printf(">> %s; about to go into DEFAULT", sorterName)
+	intervalsAfterDefault := processInterval(intervalsPassingOnThisStep, s.DefaultState, sorters)
+	log.Printf(">> %s; after defaul. passing are %+v", sorterName, intervalsAfterDefault)
+	combinationsAccepted += intervalsAfterDefault
+	log.Printf(">> %s; results after default %d", sorterName, combinationsAccepted)
+
+	return
+}
+
--- a/day2/input
+++ b/day2/input
@@ -1,100 +0,0 @@
-Game 1: 4 green, 3 blue, 11 red; 7 red, 5 green, 10 blue; 3 green, 8 blue, 8 red; 4 red, 12 blue; 15 red, 3 green, 10 blue
-Game 2: 3 red, 1 blue, 2 green; 1 blue, 9 green; 1 red, 10 green
-Game 3: 5 green, 9 red, 4 blue; 3 green, 7 blue; 12 blue, 3 green, 3 red; 3 blue, 7 red, 2 green; 7 blue, 3 green, 10 red
-Game 4: 2 green, 2 blue; 12 red, 9 green, 2 blue; 13 green, 15 red, 4 blue; 14 red, 3 green, 5 blue; 6 red, 1 green; 1 blue, 2 red, 2 green
-Game 5: 2 green, 6 blue; 1 red, 3 green, 5 blue; 3 green, 4 blue; 3 blue, 5 green, 1 red; 5 blue
-Game 6: 5 green, 1 blue, 3 red; 8 green, 15 red; 16 green, 5 red, 1 blue
-Game 7: 1 blue, 3 red, 11 green; 18 red, 16 blue, 5 green; 13 blue, 5 green; 1 red, 8 green, 15 blue
-Game 8: 1 green, 14 blue, 1 red; 10 blue; 1 green
-Game 9: 4 green, 12 blue, 1 red; 14 blue; 2 blue, 4 green; 4 green, 1 red, 10 blue
-Game 10: 11 green, 9 red; 12 red, 9 green; 5 red, 7 blue, 5 green; 6 green, 1 blue, 12 red; 3 red, 3 blue; 16 red, 9 blue, 7 green
-Game 11: 11 green, 1 red, 9 blue; 2 red, 13 green, 5 blue; 5 green, 2 red, 5 blue; 5 green, 7 blue; 1 red, 5 blue, 1 green
-Game 12: 5 green, 1 red; 1 red, 4 green; 1 blue, 12 green; 15 green, 4 blue; 4 blue, 19 green; 16 green, 4 blue
-Game 13: 1 red, 9 green, 5 blue; 10 blue, 7 green, 1 red; 3 green, 2 red, 14 blue; 16 blue, 3 red
-Game 14: 9 red, 1 blue, 2 green; 16 blue, 7 red; 2 green, 3 red, 14 blue; 1 green, 9 blue
-Game 15: 6 blue; 4 blue; 1 red, 16 blue, 3 green
-Game 16: 14 green, 5 red, 1 blue; 1 red, 1 blue; 5 blue
-Game 17: 1 blue, 1 green, 3 red; 2 red, 2 blue, 2 green; 1 blue, 1 red; 1 red, 2 green, 2 blue; 2 blue; 1 green, 2 red, 1 blue
-Game 18: 4 blue, 2 green, 1 red; 1 green, 1 red, 10 blue; 1 green, 1 red, 2 blue; 1 red, 5 blue; 3 green, 6 blue; 1 red, 1 green, 7 blue
-Game 19: 1 blue, 13 green, 12 red; 7 blue, 2 green, 1 red; 1 blue, 3 red, 3 green; 3 blue, 8 green, 10 red; 7 blue, 2 green
-Game 20: 1 red, 17 blue; 10 blue, 5 green; 9 green, 1 red, 3 blue; 1 red, 5 green, 1 blue
-Game 21: 3 red, 6 blue, 5 green; 4 blue, 1 red, 7 green; 6 blue, 4 red, 9 green
-Game 22: 11 blue, 2 red, 6 green; 16 blue, 5 red, 6 green; 12 red, 2 green, 10 blue; 14 blue, 2 green, 11 red
-Game 23: 3 red, 5 green; 10 blue, 1 green, 9 red; 2 red, 10 green, 9 blue; 9 blue, 7 green
-Game 24: 8 blue, 1 red; 3 red, 9 blue; 9 green, 2 red, 8 blue
-Game 25: 2 red, 1 green, 1 blue; 1 green, 12 blue, 2 red; 2 red, 1 blue; 2 blue; 1 green, 10 blue; 6 blue
-Game 26: 2 red; 4 green, 1 red, 7 blue; 11 blue, 2 red, 4 green; 1 red, 1 blue; 1 red, 5 green, 12 blue
-Game 27: 1 red, 7 green, 8 blue; 13 green, 12 blue, 1 red; 6 red, 1 green, 10 blue; 8 red, 2 blue, 2 green; 11 blue, 4 green, 4 red
-Game 28: 1 red, 8 blue, 3 green; 12 green, 4 blue; 1 red, 4 blue, 11 green; 7 blue, 10 green, 10 red; 11 blue, 7 red, 8 green; 10 red, 2 green, 2 blue
-Game 29: 4 green, 2 red; 1 blue, 11 red; 2 blue, 3 green, 1 red; 16 red; 3 green, 8 red, 1 blue; 2 blue, 7 green, 12 red
-Game 30: 1 blue, 3 green; 4 green, 2 blue; 3 red, 5 blue; 4 green, 1 red
-Game 31: 2 red, 2 blue, 3 green; 2 green, 3 blue, 8 red; 7 red, 16 blue, 2 green; 5 red, 20 blue, 2 green
-Game 32: 2 red, 1 green, 4 blue; 4 green, 4 red, 1 blue; 4 red, 4 blue; 1 blue, 4 red, 2 green; 4 blue, 3 green, 4 red
-Game 33: 11 green, 4 blue, 10 red; 2 green, 13 red, 7 blue; 13 red, 2 blue, 8 green; 15 red, 9 blue, 12 green; 14 red, 10 green, 2 blue; 13 red, 7 green
-Game 34: 11 red, 6 blue, 4 green; 16 red, 7 blue, 4 green; 6 red, 18 green, 6 blue; 3 blue, 16 red, 3 green; 2 red, 3 blue, 17 green; 3 green, 9 red, 6 blue
-Game 35: 6 green, 10 red, 12 blue; 4 red, 1 blue, 2 green; 3 green, 8 blue, 7 red; 6 red, 12 blue, 2 green
-Game 36: 4 green, 2 blue, 2 red; 3 green, 10 red, 1 blue; 1 blue, 3 green, 2 red; 2 green, 1 red; 1 blue, 5 red
-Game 37: 3 blue, 1 red, 2 green; 8 red, 4 green, 10 blue; 4 red, 4 green
-Game 38: 13 green, 3 red, 2 blue; 1 red, 13 green, 2 blue; 20 green, 3 red, 2 blue; 1 red, 2 blue, 12 green
-Game 39: 13 blue, 1 red, 8 green; 5 red, 3 green, 8 blue; 6 blue, 4 green; 18 blue, 7 green, 1 red; 4 green, 3 blue, 5 red; 6 blue, 4 red, 1 green
-Game 40: 2 red, 2 blue, 9 green; 1 blue, 2 red, 12 green; 16 green, 11 blue, 1 red; 1 green, 2 red; 3 blue, 2 red
-Game 41: 7 blue, 1 red; 4 blue, 1 red; 3 blue, 1 red, 2 green; 13 blue
-Game 42: 18 red, 1 green, 13 blue; 2 blue, 2 green, 7 red; 16 red, 12 blue; 1 green, 10 blue, 14 red
-Game 43: 15 red, 6 green, 2 blue; 3 blue, 9 red, 3 green; 13 red
-Game 44: 2 blue, 5 green, 3 red; 4 red, 4 blue, 19 green; 5 red, 3 blue, 9 green; 19 green, 6 red, 5 blue
-Game 45: 5 red, 4 green, 13 blue; 12 red, 10 blue; 3 green, 9 blue, 5 red; 10 blue, 18 red, 5 green; 16 red, 6 green, 17 blue
-Game 46: 3 green; 3 green, 2 blue; 4 blue, 2 red, 3 green; 5 blue, 3 green, 4 red; 1 green, 1 blue
-Game 47: 2 blue, 1 red, 10 green; 2 red; 6 red, 1 blue; 16 red, 2 blue, 8 green; 5 blue, 8 red, 7 green
-Game 48: 11 green, 4 red, 2 blue; 2 blue, 5 green, 8 red; 9 green, 6 red; 3 red, 3 green, 1 blue; 2 blue, 12 green, 17 red
-Game 49: 10 blue, 4 green, 1 red; 10 red, 10 blue; 12 blue, 7 red; 13 blue, 6 green
-Game 50: 1 red, 19 green, 7 blue; 4 red, 1 green, 5 blue; 16 green, 8 red, 8 blue
-Game 51: 12 green, 18 blue; 13 green, 14 blue, 4 red; 7 green, 4 red, 14 blue; 8 green, 2 blue, 3 red; 16 blue, 8 green
-Game 52: 9 blue, 9 green, 3 red; 8 blue, 1 green, 13 red; 2 red, 8 blue, 9 green; 13 red, 4 green; 6 green, 15 red; 11 blue, 11 red, 9 green
-Game 53: 2 red, 4 green, 3 blue; 5 blue, 16 green; 4 blue, 8 red, 12 green
-Game 54: 6 red, 16 green; 6 red, 15 green; 8 green, 8 red, 2 blue
-Game 55: 9 red, 2 green; 4 blue; 2 green, 2 red, 7 blue; 1 red, 16 blue, 1 green; 17 blue, 5 red
-Game 56: 14 green, 3 red, 9 blue; 14 blue, 15 green, 2 red; 8 red, 13 blue, 15 green; 15 blue, 2 red, 12 green; 3 red, 7 blue, 10 green; 10 blue, 13 green
-Game 57: 1 blue, 10 green, 2 red; 4 blue, 9 green, 11 red; 2 blue
-Game 58: 4 red, 2 blue, 5 green; 1 blue, 5 green, 4 red; 3 green, 4 red, 8 blue; 4 blue, 7 green; 5 green, 4 blue; 1 blue, 6 red
-Game 59: 5 blue, 4 red, 3 green; 8 blue, 12 green, 5 red; 5 red, 8 blue, 15 green
-Game 60: 6 red, 12 blue, 1 green; 10 blue, 20 green, 4 red; 6 blue, 1 green, 5 red; 9 red, 12 blue, 14 green; 15 green, 1 red, 14 blue; 10 green, 13 blue
-Game 61: 1 blue, 12 green, 3 red; 4 green, 1 red, 4 blue; 8 red, 4 green, 6 blue
-Game 62: 6 blue, 7 green, 3 red; 6 blue, 3 red, 3 green; 11 green, 6 red, 2 blue; 2 red, 6 blue, 3 green; 2 green, 3 blue, 3 red; 3 blue, 11 green, 11 red
-Game 63: 5 green, 6 blue, 4 red; 6 green, 12 blue; 3 green, 9 blue, 10 red; 1 blue, 4 red, 5 green
-Game 64: 10 green, 14 red; 1 blue, 9 red; 3 green, 10 blue, 14 red; 5 green, 3 blue, 12 red; 5 blue, 12 red, 13 green
-Game 65: 1 red, 5 green, 10 blue; 14 red, 5 green, 10 blue; 10 blue, 10 red
-Game 66: 9 green, 8 blue, 1 red; 8 red, 14 blue; 8 red, 7 blue, 2 green; 4 blue, 3 green, 5 red; 2 red, 8 green, 8 blue
-Game 67: 4 red, 3 green, 3 blue; 4 green, 1 blue, 4 red; 1 blue, 3 red; 10 blue; 16 blue, 6 red, 4 green
-Game 68: 6 blue, 6 green, 9 red; 4 blue, 9 red, 3 green; 3 blue, 8 red
-Game 69: 4 green, 12 red, 3 blue; 2 red, 3 blue; 2 blue, 4 red, 2 green; 1 blue, 3 red
-Game 70: 4 red, 3 green, 15 blue; 1 green, 4 red; 1 red, 1 green, 5 blue
-Game 71: 4 blue, 2 red, 10 green; 7 red, 6 blue, 11 green; 4 blue, 7 red, 8 green
-Game 72: 9 red, 9 blue, 1 green; 4 red, 6 green, 5 blue; 3 green, 7 red, 2 blue
-Game 73: 3 green, 9 red; 4 green, 15 red; 12 red, 2 blue; 14 red, 3 green
-Game 74: 2 red, 6 blue, 1 green; 3 red, 6 blue; 1 green, 12 blue, 14 red
-Game 75: 3 green, 18 red; 1 green, 7 red, 1 blue; 2 red, 2 green, 3 blue; 11 red; 2 red, 3 green, 2 blue
-Game 76: 6 green, 2 red, 5 blue; 13 green, 5 blue; 5 blue, 1 red, 1 green
-Game 77: 4 blue, 6 green, 3 red; 15 red, 1 green; 4 green, 11 red, 13 blue; 8 blue, 6 green, 9 red; 3 blue, 1 green, 11 red; 3 green, 3 red
-Game 78: 11 green, 1 blue, 2 red; 7 red, 16 blue, 11 green; 9 blue, 10 red, 6 green; 1 green, 8 blue, 10 red; 8 blue, 6 red, 1 green
-Game 79: 2 blue, 5 green, 4 red; 1 blue, 1 red, 1 green; 1 blue, 5 red, 10 green; 6 red, 3 green, 3 blue; 8 red, 9 green, 6 blue; 7 blue, 6 green, 13 red
-Game 80: 10 green, 7 blue, 5 red; 5 red, 1 green, 6 blue; 8 blue, 2 red, 8 green
-Game 81: 3 green, 10 red; 6 blue, 8 green, 14 red; 4 green, 4 blue, 13 red; 5 blue, 11 green, 6 red; 16 red, 8 green, 5 blue; 6 green, 18 red, 6 blue
-Game 82: 13 red, 1 green, 7 blue; 8 green, 4 blue, 12 red; 18 red, 5 green, 3 blue; 13 red, 4 green, 9 blue
-Game 83: 1 red, 3 green, 4 blue; 5 blue, 4 green, 1 red; 3 green, 1 red, 12 blue; 4 green, 11 blue
-Game 84: 3 blue, 10 green, 2 red; 3 red, 8 blue; 11 blue, 12 red, 14 green; 2 red, 11 green, 2 blue
-Game 85: 8 blue, 2 green, 1 red; 13 blue, 6 red; 3 blue, 5 green
-Game 86: 16 red, 8 blue; 7 blue; 16 red, 16 blue, 1 green; 15 blue, 11 red; 2 green, 7 red, 5 blue
-Game 87: 6 green, 9 blue, 4 red; 1 red, 1 green, 4 blue; 5 blue, 13 green, 3 red; 2 green, 4 red; 16 blue, 10 green, 3 red
-Game 88: 1 blue, 14 red; 14 red, 3 blue, 8 green; 1 blue, 5 green
-Game 89: 12 green, 14 blue, 3 red; 2 red, 3 blue, 3 green; 2 blue, 8 green; 1 red, 3 green, 15 blue; 3 red, 5 blue
-Game 90: 3 blue, 17 red, 11 green; 2 red, 2 blue, 7 green; 7 blue; 8 blue, 4 green, 10 red; 1 blue, 4 red
-Game 91: 10 red, 9 blue, 8 green; 5 blue, 10 red, 2 green; 11 red, 17 green, 7 blue; 12 blue, 16 red, 18 green; 20 green, 5 blue, 15 red
-Game 92: 1 green, 14 red, 1 blue; 2 blue, 6 green; 9 red, 6 green; 5 blue, 5 red, 2 green; 3 blue, 3 green, 10 red; 5 blue, 1 red
-Game 93: 10 green, 1 red, 6 blue; 16 red, 5 blue, 2 green; 3 red, 7 green, 11 blue; 12 green, 5 blue, 4 red; 8 green, 7 blue, 10 red; 1 red, 5 blue
-Game 94: 3 blue, 1 red, 3 green; 1 blue, 4 green, 4 red; 9 green
-Game 95: 3 green, 5 blue, 9 red; 2 green, 9 red, 2 blue; 12 red, 9 green; 11 green, 9 red, 9 blue; 9 blue, 6 green, 10 red; 13 red, 2 blue, 5 green
-Game 96: 2 red, 19 blue, 2 green; 10 blue, 1 red, 2 green; 9 blue, 1 red; 2 green, 3 blue; 1 green, 1 red, 11 blue
-Game 97: 6 green, 7 blue, 5 red; 7 green, 1 red, 11 blue; 6 green, 6 red, 5 blue; 2 red, 9 blue, 1 green
-Game 98: 5 green, 8 red, 15 blue; 16 green, 9 blue, 8 red; 5 blue, 3 red, 2 green; 13 blue, 12 green, 4 red; 2 red, 15 green, 3 blue; 1 green, 11 blue, 2 red
-Game 99: 1 green, 7 blue, 6 red; 16 blue, 9 red; 1 green, 17 red, 12 blue; 15 red, 7 blue; 8 blue, 14 red
-Game 100: 5 blue, 11 red, 6 green; 11 red, 2 blue, 5 green; 6 blue, 6 green; 2 blue, 6 red, 15 green; 7 red, 4 blue, 7 green
--- a/day20/example1
+++ b/day20/example1
@@ -0,0 +1,5 @@
+broadcaster -> a, b, c
+%a -> b
+%b -> c
+%c -> inv
+&inv -> a
--- a/day20/example2
+++ b/day20/example2
@@ -0,0 +1,5 @@
+broadcaster -> a
+%a -> inv, con
+&inv -> b
+%b -> con
+&con -> output
--- a/day20/looping.go
+++ b/day20/looping.go
@@ -0,0 +1,142 @@
+package day20
+
+import (
+	"cmp"
+	"log"
+	"slices"
+)
+
+func TransitiveOutputs(from string, allModules map[string]Module, visited map[string]any) map[string]any {
+	// log.Printf("looking for transitive children of %s\n", from)
+	_, alreadyProcessed := visited[from]
+	if alreadyProcessed {
+		return visited
+	}
+
+	module, found := allModules[from]
+	if !found {
+		return visited
+	}
+
+	visited[from] = struct{}{}
+	children := module.Outputs()
+	for _, output := range children {
+		TransitiveOutputs(output, allModules, visited)
+	}
+
+	delete(visited, "th")
+
+	// for key, _ := range visited {
+	// 	result = append(result, key)
+	// }
+
+	return visited
+}
+
+func FindSubGraphLoopLength(subgraph map[string]any, allModules map[string]Module, monitorOutputsOf string) (fromStep, toStep int, monitoredPulses map[int][]PulseType) {
+	step := 1
+	seenSubgraphStates := make(map[string]int)
+	monitoredPulses = make(map[int][]PulseType)
+	for {
+		monitoredPulsesOfTheStep := PropagateButtonPressWithMonitor(allModules, step, monitorOutputsOf)
+		subgraphModules := make(map[string]Module)
+		for key, _ := range subgraph {
+			subgraphModules[key] = allModules[key]
+		}
+		subgraphState := ModulesState(subgraphModules)
+		// log.Printf("looping %d. state is %s", step, subgraphState)
+
+		prevSteps, known := seenSubgraphStates[subgraphState]
+		if known {
+			// log.Printf(">>> searching for loop of %+v", subgraph)
+			log.Printf(">>> found loop from %d to %d. of size %d\n", prevSteps, step - 1, step - prevSteps)
+			return prevSteps, step, monitoredPulses
+		}
+
+		seenSubgraphStates[subgraphState] = step
+		if len(monitoredPulsesOfTheStep) > 0 {
+			monitoredPulses[step] = monitoredPulsesOfTheStep
+		}
+		step++
+	}
+	panic("")
+}
+
+// i see lot's of 'LowPulse'
+// while i want to find steps where all inputs are remembered as High.
+// so i'm interested in steps with "high" pulses and next steps that make it 'low' after
+func FilterMonitoredPulses(requestedPulses map[int][]PulseType) {
+	afterHigh := false
+	for step, pulses := range requestedPulses {
+		processedPulses := make([]PulseType, 0)
+		for _, pulse := range pulses {
+			if pulse == HighPulse {
+				processedPulses = append(processedPulses, pulse)
+				afterHigh = true
+				continue
+			}
+			if afterHigh {
+				processedPulses = append(processedPulses, pulse)
+				afterHigh = false
+			}
+		}
+		if len(processedPulses) > 0 {
+			requestedPulses[step] = processedPulses
+		} else {
+			delete(requestedPulses, step)
+		}
+	}
+}
+
+// loop math
+// 2023/12/20 12:35:08 >>> searching for loop of sr
+// 2023/12/20 12:35:08 >>> found loop from 1 to 4028. of size 4028
+// 2023/12/20 12:35:08 the pulses: +map[4026:[high low]]
+// 2023/12/20 12:35:08 >>> searching for loop of ch
+// 2023/12/20 12:35:08 >>> found loop from 0 to 3923. of size 3924
+// 2023/12/20 12:35:08 the pulses: +map[3817:[high low]]
+// 2023/12/20 12:35:08 >>> searching for loop of hd
+// 2023/12/20 12:35:09 >>> found loop from 0 to 3793. of size 3794
+// 2023/12/20 12:35:09 the pulses: +map[3427:[high low]]
+// 2023/12/20 12:35:09 >>> searching for loop of bx
+// 2023/12/20 12:35:09 >>> found loop from 0 to 3739. of size 3740
+// 2023/12/20 12:35:09 the pulses: +map[3211:[high low]]
+func CalcCommonStep() int {
+	type LoopInfo struct {
+		loopLength, initialDesiredStep int
+		curStep int
+	}
+	loopA := &LoopInfo{4027, 4026, 4026}
+	loopB := &LoopInfo{3923, 3922, 3922}
+	loopC := &LoopInfo{3793, 3792, 3792}
+	loopD := &LoopInfo{3739, 3211, 3738}
+
+
+
+	// nope they can have different amount of own loops.
+	// so it's 4 unknowns, 5 unknowns.
+	// i could store 4 'steps' and on each iteration increase the smallest one
+	// until they are all equal
+
+	loops := []*LoopInfo{loopA, loopB, loopC, loopD}
+	allSameStep := loopA.curStep == loopB.curStep &&
+		loopB.curStep == loopC.curStep &&
+		loopC.curStep == loopD.curStep
+
+	i := 0
+
+	for !allSameStep {
+		minLoop := slices.MinFunc(loops, func(a *LoopInfo, b *LoopInfo) int {
+			return cmp.Compare(a.curStep, b.curStep)
+		})
+		minLoop.curStep += minLoop.loopLength
+
+		if i % 10000000 == 0 {
+			log.Printf(">> iterations made: %d, min step is %d", i, minLoop.curStep)
+		}
+
+		i++
+	}
+
+	return loopA.curStep
+}
--- a/day20/modules.go
+++ b/day20/modules.go
@@ -0,0 +1,277 @@
+package day20
+
+import (
+	"fmt"
+	"regexp"
+	"slices"
+	"strings"
+)
+
+type PulseType int
+func (pt PulseType)String() string {
+	types := []string{"high", "low"}
+	return types[pt]
+}
+
+const (
+	HighPulse PulseType = iota
+	LowPulse
+)
+
+type Signal struct {
+	To, From string
+	PulseType PulseType
+}
+
+type Module interface {
+	Receive(s Signal) []Signal
+	Outputs() []string
+	StateSnapshot() string
+	MermaidFlow() string
+}
+
+// Modules
+type FlipFlop struct {
+	Name string
+	OutputNames []string
+	IsOn bool
+}
+
+// ignores HighPulse
+// on LowPulse - toggle state and send signal
+func (ff *FlipFlop)Receive(s Signal) []Signal {
+	if s.PulseType == HighPulse {
+		return []Signal{}
+	}
+
+	ff.IsOn = !ff.IsOn
+	outTemplate := Signal{
+		From: ff.Name,
+	}
+	if ff.IsOn {
+		outTemplate.PulseType = HighPulse
+	} else {
+		outTemplate.PulseType = LowPulse
+	}
+
+	result := make([]Signal, len(ff.OutputNames))
+	for i, outName := range ff.OutputNames {
+		out := outTemplate
+		out.To = outName
+		result[i] = out
+	}
+
+	return result
+}
+
+func (ff *FlipFlop)Outputs() []string {
+	return ff.OutputNames
+}
+
+func (ff *FlipFlop)String() string {
+	return fmt.Sprintf("[flip-flop '%s' (on: %t) -> %s]", ff.Name, ff.IsOn, ff.OutputNames)
+}
+
+func (ff *FlipFlop)StateSnapshot() string {
+	return ff.String()
+}
+
+func (ff *FlipFlop)MermaidFlow() string {
+	result := "\n"
+	for _, toName := range ff.OutputNames {
+		result += fmt.Sprintf("%s --> %s\n", ff.Name, toName)
+	}
+	return result
+}
+
+func IsLineFlipFlop(line string) bool {
+	return strings.HasPrefix(line, "%")
+}
+
+func ParseFlipFlop(line string) (result FlipFlop) {
+	re := regexp.MustCompile(`%(?P<NAME>\D+) -> (?P<OUTPUTS>.+)`)
+	matches := re.FindStringSubmatch(line)
+
+	// log.Printf("matching %s getting '%s' and '%s'\n", line, matches[1], matches[2])
+	result.Name = matches[1]
+	result.OutputNames = strings.Split(matches[2], ", ")
+
+	return
+}
+
+type Broadcast struct {
+	OutputNames []string
+}
+
+// send same pulse to all outputs
+func (b *Broadcast)Receive(s Signal) (result []Signal) {
+	signalTemplate := Signal{From: "broadcast", PulseType: s.PulseType}
+	for _, out := range b.OutputNames {
+		outSignal := signalTemplate
+		outSignal.To = out
+		result = append(result, outSignal)
+	}
+	return
+}
+
+func (b *Broadcast)Outputs() []string {
+	return b.OutputNames
+}
+
+func (b *Broadcast)String() string {
+	return fmt.Sprintf("[broadcast -> %+v]", b.OutputNames)
+}
+func (b *Broadcast)StateSnapshot() string {
+	return b.String()
+}
+
+func (b *Broadcast)MermaidFlow() string {
+	result := "\n"
+	for _, toName := range b.OutputNames {
+		result += fmt.Sprintf("%s --> %s\n", "broadcast", toName)
+	}
+	return result
+}
+
+func IsLineBroadcast(line string) bool {
+	return strings.HasPrefix(line, "broadcaster")
+}
+
+func ParseBroadcast(line string) (result Broadcast) {
+	re := regexp.MustCompile(`broadcaster -> (?P<OUTPUTS>.+)`)
+	matches := re.FindStringSubmatch(line)
+
+	result.OutputNames = strings.Split(matches[1], ", ")
+	return
+}
+
+type Conjunction struct {
+	Name string
+	OutputNames []string
+	MostRecentPulseFromInputIsHigh map[string]bool
+}
+
+// remembers last signal type from all inputs (initial default is Low)
+// when receiving pulse, first update memory for that input
+// then if for all inputs remembered is high - send LowPulse
+// otherwise if some remembers are low - send HighPulse
+func (c *Conjunction)Receive(s Signal) (result []Signal) {
+	c.MostRecentPulseFromInputIsHigh[s.From] = s.PulseType == HighPulse
+
+	allHigh := true
+	for _, latestImpulseHight := range c.MostRecentPulseFromInputIsHigh {
+		if !latestImpulseHight {
+			allHigh = false
+			break
+		}
+	}
+
+	outTemplate := Signal{From: c.Name}
+	if allHigh {
+		outTemplate.PulseType = LowPulse
+	} else {
+		outTemplate.PulseType = HighPulse
+	}
+
+	for _, outName := range c.OutputNames {
+		outSignal := outTemplate
+		outSignal.To = outName
+		result = append(result, outSignal)
+	}
+
+	return
+}
+
+func (c *Conjunction)Outputs() []string {
+	return c.OutputNames
+}
+
+func (c *Conjunction)RegisterInputs(allModules map[string]Module) {
+	for name, module := range allModules {
+		if slices.Contains( module.Outputs(), c.Name) {
+			c.MostRecentPulseFromInputIsHigh[name] = false
+		}
+	}
+}
+
+func (c *Conjunction)String() string {
+	return fmt.Sprintf("[conjunction '%s' -> %+v]", c.Name, c.OutputNames)
+}
+
+func (c *Conjunction)StateSnapshot() string {
+	return fmt.Sprintf("[conjunction '%s' -> %+v]", c.Name, c.MostRecentPulseFromInputIsHigh)
+}
+
+func (c *Conjunction)MermaidFlow() string {
+	result := "\n"
+	result += fmt.Sprintf("%s{%s}\n", c.Name, c.Name)
+	for _, toName := range c.OutputNames {
+		result += fmt.Sprintf("%s --> %s\n", c.Name, toName)
+	}
+	return result
+
+}
+
+func IsLineConjunction(line string) bool {
+	return strings.HasPrefix(line, "&")
+}
+
+func ParseConjunction(line string) (result Conjunction) {
+	re := regexp.MustCompile(`&(?P<NAME>\D+) -> (?P<OUTPUTS>.+)`)
+	matches := re.FindStringSubmatch(line)
+
+	// log.Printf("matching %s getting '%s' and '%s'\n", line, matches[1], matches[2])
+	result.Name = matches[1]
+	result.OutputNames = strings.Split(matches[2], ", ")
+
+	result.MostRecentPulseFromInputIsHigh = map[string]bool{}
+
+	return
+}
+
+type Button struct {}
+
+func (b *Button)Receive(s Signal) []Signal {
+	return []Signal{
+		{ To: "broadcast", From: "button", PulseType: LowPulse },
+	}
+}
+
+func (b *Button)Outputs() []string {
+	return []string{"broadcast"}
+}
+
+func (b *Button)String() string {
+	return "[button]"
+}
+
+func (b *Button)StateSnapshot() string {
+	return b.String()
+}
+
+func (b *Button)MermaidFlow() string {
+	return "button --> broadcast\n"
+}
+
+type Output struct {}
+
+func (o *Output)Receive(s Signal) []Signal {
+	// log.Print("Outut received signal: ", s)
+	return []Signal{}
+}
+
+func (o *Output)Outputs() []string {
+	return []string{}
+}
+
+func (o *Output)String() string {
+	return "[output]"
+}
+
+func (o *Output)StateSnapshot() string {
+	return o.String()
+}
+
+func (o *Output)MermaidFlow() string {
+	return ""
+}
--- a/day20/modules_test.go
+++ b/day20/modules_test.go
@@ -0,0 +1,61 @@
+package day20
+
+import (
+	"slices"
+	"testing"
+)
+
+func TestParseFlipFlop(t *testing.T) {
+	flipFlopLine := "%a -> inv, con"
+	if !IsLineFlipFlop(flipFlopLine) {
+		t.Errorf("line '%s' should be flip flop\n", flipFlopLine)
+	}
+	module := ParseFlipFlop(flipFlopLine)
+	t.Logf("got module %+v\n", module)
+}
+
+func TestParseBroadcast(t *testing.T) {
+	broadcastLine := "broadcaster -> a, b, c"
+	if !IsLineBroadcast(broadcastLine) {
+		t.Error("expected line to pass broadcast check")
+	}
+	module := ParseBroadcast(broadcastLine)
+	t.Logf("got module %+v\n", module)
+
+	if !slices.Equal(module.OutputNames, []string{"a", "b", "c"}) {
+		t.Errorf("got unexpected outputs: %+v\n", module.OutputNames)
+	}
+}
+
+func TestParseConjunction(t *testing.T) {
+	conjunctionLine := "&inv -> b"
+	if !IsLineConjunction(conjunctionLine) {
+		t.Errorf("line '%s' should be flip flop\n", conjunctionLine)
+	}
+	module := ParseConjunction(conjunctionLine)
+	t.Logf("got module %+v\n", module)
+	moduleAsExpected := module.Name != "inv" || slices.Equal(module.OutputNames, []string{"b"})
+	if !moduleAsExpected {
+		t.Fail()
+	}
+}
+
+func TestReadManyModules(t *testing.T) {
+	filename := "example1"
+	modules := ReadModules(filename)
+	t.Logf("> read example1:\n%+v", modules)
+
+	filename2 := "example2"
+	modules2 := ReadModules(filename2)
+	t.Logf("> read example2:\n%+v", modules2)
+}
+
+func TestConjunctionRegisterInputs(t *testing.T) {
+	filename := "example2"
+	modules := ReadModules(filename)
+
+	conjunctionInv := modules["inv"].(*Conjunction)
+	conjunctionInv.RegisterInputs(modules)
+
+	t.Logf("after registering inputs on $inv : %+v", conjunctionInv.MostRecentPulseFromInputIsHigh)
+}
--- a/day20/my-mermaid.mmd
+++ b/day20/my-mermaid.mmd
@@ -0,0 +1,178 @@
+flowchart LR
+
+gm --> tj
+gm --> gf
+
+nn --> ff
+nn --> db
+
+broadcast --> sr
+broadcast --> ch
+broadcast --> hd
+broadcast --> bx
+
+qm --> gm
+
+xm --> db
+
+pf --> qx
+
+ln --> gf
+ln --> qq
+
+pm --> vc
+pm --> qk
+
+rz --> qx
+rz --> cv
+
+gf{gf}
+gf --> fj
+gf --> qm
+gf --> xn
+gf --> sr
+
+fn --> pr
+fn --> gf
+
+lc --> gf
+lc --> fn
+
+sr --> gf
+sr --> vl
+
+jz --> qj
+jz --> db
+
+th{th}
+th --> rx
+
+cb --> kt
+
+bf --> qx
+bf --> pf
+
+qj --> xm
+qj --> db
+
+ch --> db
+ch --> mc
+
+ff --> pl
+
+pr --> gf
+
+zd --> ln
+zd --> gf
+
+qn{qn}
+qn --> th
+
+kt --> qx
+kt --> rz
+
+fj --> zd
+
+tj --> lc
+tj --> gf
+
+bx --> qx
+bx --> qp
+
+cr --> gx
+cr --> vc
+
+vm --> cl
+
+nh --> hv
+
+qk --> vc
+
+jd --> qx
+jd --> vm
+
+hd --> vc
+hd --> nh
+
+sf --> bp
+
+cl --> qx
+cl --> bf
+
+vc{vc}
+vc --> lr
+vc --> hd
+vc --> ks
+vc --> qn
+vc --> gx
+vc --> nh
+vc --> hv
+
+bp --> db
+bp --> jz
+
+cc --> nn
+
+lr --> sb
+
+qq --> qm
+qq --> gf
+
+db{db}
+db --> ff
+db --> ds
+db --> sf
+db --> ch
+db --> cc
+db --> xf
+
+vl --> gf
+vl --> fj
+
+ks --> vz
+
+xn{xn}
+xn --> th
+
+xf{xf}
+xf --> th
+
+pl --> sf
+pl --> db
+
+zl{zl}
+zl --> th
+
+vz --> cr
+vz --> vc
+
+gx --> cd
+
+mc --> ds
+mc --> db
+
+qp --> cb
+qp --> qx
+button --> broadcast
+
+cv --> xz
+
+xz --> jd
+
+qx{qx}
+qx --> cb
+qx --> cv
+qx --> bx
+qx --> xz
+qx --> vm
+qx --> zl
+
+hv --> lr
+
+cd --> pm
+cd --> vc
+
+sb --> ks
+sb --> vc
+
+ds --> cc
--- a/day20/my-mermaid.mmd.svg
+++ b/day20/my-mermaid.mmd.svg
--- a/day20/notes.org
+++ b/day20/notes.org
@@ -0,0 +1,180 @@
+#+title: Notes
+* ok. only thought i had was to simulate the thing
+
+have single executor, that takes head of the queue,
+signals would be (to, from, type)
+
+take 'to' out of the map, call it's 'process(from, type)'
+
+and different types of executors would implement this differently.
+and return a slice of new signals in order, to be appended.
+
+if queue is empty - the single button press is propagated and all is well.
+
+we will take snapshot of state, String() repr of all executors should be enough,
+and save amount of signals sent so far
+* also, i suppose i'd want to have entry points for fiddling with single executors to be test cases.
+* modules to implement
+** DONE Broadcast
+** DONE Flip-Flop
+** DONE Conjunction
+** DONE Button
+* i guess each module could test if string is it's a representation of this type
+and would be able to parse it? into it's own struct?
+well, those are just functions, since only methods are associated, so ok
+* how do i run single tests?
+** running tests from the module
+#+begin_src bash
+go test sunshine.industries/aoc2023/day20 -v
+#+end_src
+
+have file with `_test.go` and `func Test...(t *testing.T) {}` name
+** running single test
+#+begin_src bash
+go test sunshine.industries/aoc2023/day20 -v -run TestParseFlipFlop
+#+end_src
+* yikes. if i don't know the 'inputs' to the conjunction, don't know how to check for 'all high'
+let's add registering after the map is read.
+* well. for part 2 brute force doesn't work.
+how could i examine inputs to the 'rx' to see when it will receive 'low'?
+
+i suppose inputs could be on prime cycles, which would align to all required values only on a very big step?
+
+let's do some kind of visualiztion?
+
+how would i do graphql or mermaidjs?
+
+flowchard in mermaid should be it
+
+go run . > day20/my-mermaid.mmd
+* so, looking at the thingy.
+rx is produced by &th
+which has inputs of
+     11:&xn -> th
+     14:&qn -> th
+     16:&xf -> th
+     32:&zl -> th
+
+
+for rx to receive a low pulse.
+&th should receive High Pulse, while all other inputs alse remembered as high.
+
+this is not too easy.
+but first let's check if loops over
+- xn
+- qn
+- xh
+- zl
+
+are manageable.
+
+well.
+i'll need to what?
+not only track the inputs of the th.
+but state of the 'subloop'
+and they are separate
+
+is there an easy way to collect the names from each subloop?
+i guess i could write a collect.
+
+from each of outputs of 'broadcast'
+
+then have a funciton that checks loop size of each subgraphs
+
+but i will also need to figure out on which steps output of the loop is remembered as High \ Low
+
+let's start with loop size? and modify things if need be
+** starting points of loops:
+children of the broadcast:
+broadcaster -> sr, ch, hd, bx
+
+sr, ch, hd, bx
+** ok. some data here
+2023/12/20 12:05:06 >>> searching for loop of sr
+2023/12/20 12:05:06 >>> found loop from 1 to 4028. of size 4028
+2023/12/20 12:05:06 >>> searching for loop of ch
+2023/12/20 12:05:06 >>> found loop from 0 to 3923. of size 3924
+2023/12/20 12:05:06 >>> searching for loop of hd
+2023/12/20 12:05:06 >>> found loop from 0 to 3793. of size 3794
+2023/12/20 12:05:06 >>> searching for loop of bx
+2023/12/20 12:05:07 >>> found loop from 0 to 3739. of size 3740
+
+one of these guys starts from 1, not from 0.
+this is unusual, but OK
+
+now, i want to figure out what are steps where output for the each cycle is 'considered as saved as 1'
+
+i guess i could just directly probe the
+`th`
+
+on each step up to 4028
+
+but also, if the signallings from those are rare - would be eaiser to collect steps of each signal.
+** ok. i collected 'monitored pulses' and i see lots of 'Low'
+what i want is all "high" and first low after those.
+** oh wow, this crap
+2023/12/20 12:30:05 >>> searching for loop of ch
+2023/12/20 12:30:05 >>> found loop from 1 to 3924. of size 3924
+2023/12/20 12:30:05 the pulses
+map[3922:[high low]]
+2023/12/20 12:30:05 >>> searching for loop of hd
+2023/12/20 12:30:05 >>> found loop from 0 to 3793. of size 3794
+2023/12/20 12:30:05 the pulses
+map[3661:[high low]]
+2023/12/20 12:30:05 >>> searching for loop of bx
+2023/12/20 12:30:05 >>> found loop from 0 to 3739. of size 3740
+2023/12/20 12:30:05 the pulses
+map[3499:[high low]]
+2023/12/20 12:30:05 >>> searching for loop of sr
+2023/12/20 12:30:05 >>> found loop from 0 to 4027. of size 4028
+2023/12/20 12:30:05 the pulses
+map[624:[high low]]
+*** but at least these 'high low' are all on same step.
+now with info on loop start, place of pulse in the loop and length of loops,
+what is the step so that those [high low] occur on same step num?
+*** math should be:
+3922 + LOOP_N * (LOOP_LEN)
+** wait i now get different output?
+2023/12/20 12:57:50 >>> searching for loop of bx
+2023/12/20 12:57:50 >>> found loop from 1 to 3739. of size 3739
+2023/12/20 12:57:50 the pulses: +map[3738:[high low]]
+2023/12/20 12:57:50 >>> searching for loop of sr
+2023/12/20 12:57:50 >>> found loop from 0 to 4026. of size 4027
+2023/12/20 12:57:50 the pulses: +map[286:[high low]]
+2023/12/20 12:57:50 >>> searching for loop of ch
+2023/12/20 12:57:50 >>> found loop from 0 to 3922. of size 3923
+2023/12/20 12:57:50 the pulses: +map[78:[high low]]
+2023/12/20 12:57:50 >>> searching for loop of hd
+2023/12/20 12:57:51 >>> found loop from 0 to 3792. of size 3793
+2023/12/20 12:57:51 the pulses: +map[3481:[high low]]
+** why is my filtering unstable?
+** let's check for single loop?
+** yikes. but maybe
+2023/12/20 13:08:52 >>> searching for loop of sr
+2023/12/20 13:08:52 >>> found loop from 2 to 4028. of size 4027
+2023/12/20 13:08:52 the pulses: +map[4027:[high low]]
+
+2023/12/20 13:09:23 >>> searching for loop of ch
+2023/12/20 13:09:23 >>> found loop from 2 to 3924. of size 3923
+2023/12/20 13:09:23 the pulses: +map[3923:[high low]]
+
+2023/12/20 13:09:37 >>> searching for loop of hd
+2023/12/20 13:09:37 >>> found loop from 2 to 3794. of size 3793
+2023/12/20 13:09:37 the pulses: +map[3793:[high low]]
+
+2023/12/20 13:09:49 >>> searching for loop of bx
+2023/12/20 13:09:49 >>> found loop from 2 to 3740. of size 3739
+2023/12/20 13:09:49 the pulses: +map[3739:[high low]]
+
+all loops start from same plase.
+i could just do 1 press. then the loop starts. and all of them have [high low] on last place.
+so it's going to be 1 + least common ...
+** aaand, i just did least common multiple of the cycle lenghts.
+and i didn't even added 1. which is strange. i guess i did have 'off-by-one'
+crap
+*** yeah. i can start from step 1. but i need to first update State then check for previous
+
+all loops are from step 1.
+
+it's just for some reason code was unstable when i was searching for all
+*** answer is 224046542165867
--- a/day20/propagation_test.go
+++ b/day20/propagation_test.go
@@ -0,0 +1,105 @@
+package day20
+
+import (
+	"log"
+	"testing"
+)
+
+func TestPropagateButtonPressExample1(t *testing.T) {
+	filename := "example1"
+	modules := ReadModules(filename)
+	t.Log("got modules:\n", modules)
+
+	low, high := PropagateButtonPress(modules, 0)
+	t.Logf("got low %d and high %d\n", low, high)
+	t.Log("modules after single button press:\n", modules)
+
+	success := low == 8 && high == 4
+	if !success {
+		t.Errorf("expected low 8 got %d, high 4 got %d", low, high)
+	}
+}
+
+func TestPropagateButtonPressExample2(t *testing.T) {
+	filename := "example2"
+	modules := ReadModules(filename)
+	t.Log("got modules:\n", modules)
+	InitStuffs(modules)
+
+	low, high := PropagateButtonPress(modules, 0)
+	t.Logf("got low %d and high %d\n", low, high)
+	t.Log("modules after single button press:\n", modules)
+
+	success := low == 4 && high == 4
+	if !success {
+		t.Errorf("expected low 4 got %d, high 4 got %d", low, high)
+	}
+}
+
+func TestPropagateButtonPressExample2FourSteps(t *testing.T) {
+	filename := "example2"
+	modules := ReadModules(filename)
+	t.Log("got modules:\n", modules)
+	InitStuffs(modules)
+
+	initialModulesState := ModulesState(modules)
+
+	low, high := PropagateButtonPress(modules, 0)
+	t.Logf("got low %d and high %d\n", low, high)
+	t.Log("#1 button press:\n", modules)
+	success := low == 4 && high == 4
+	if !success {
+		t.Errorf("expected low 4 got %d, high 4 got %d", low, high)
+	}
+
+	low, high = PropagateButtonPress(modules, 0)
+	t.Logf("got low %d and high %d\n", low, high)
+	t.Log("#2 button press:\n", modules)
+	success = low == 4 && high == 2
+	if !success {
+		t.Errorf("expected low 4 got %d, high 2 got %d", low, high)
+	}
+	secondState := ModulesState(modules)
+	if initialModulesState == secondState {
+		t.Error("initial state should be different from second")
+	}
+
+	low, high = PropagateButtonPress(modules, 0)
+	t.Logf("got low %d and high %d\n", low, high)
+	t.Log("#3 button press:\n", modules)
+	success = low == 5 && high == 3
+	if !success {
+		t.Errorf("expected low 5 got %d, high 3 got %d", low, high)
+	}
+	thirdState := ModulesState(modules)
+	if initialModulesState == thirdState {
+		t.Error("initial state should be different from third")
+	}
+
+	low, high = PropagateButtonPress(modules, 0)
+	t.Logf("got low %d and high %d\n", low, high)
+	t.Log("#4 button press:\n", modules)
+	success = low == 4 && high == 2
+	if !success {
+		t.Errorf("expected low 4 got %d, high 2 got %d", low, high)
+	}
+
+	lastState := ModulesState(modules)
+
+	log.Print("initial modules state:\n", initialModulesState)
+	log.Print("after 4 steps modules state:\n", lastState)
+	if initialModulesState != lastState {
+		t.Error("expected state to be same after 4 steps for example 2")
+	}
+
+}
+
+func TestExample1TheQuestion(t *testing.T) {
+	filename := "example1"
+	modules := ReadModules(filename)
+	InitStuffs(modules)
+
+	low, high := Count10000ButtonPresses(modules)
+	t.Log("got low and high: ", low, high)
+	t.Log("response is: ", low * high)
+}
--- a/day20/pulsePropagation.go
+++ b/day20/pulsePropagation.go
@@ -0,0 +1,241 @@
+package day20
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func Run() int {
+	// fmt.Println("hello from dya 20")
+
+	filename := "day20/input"
+	modules := ReadModules(filename)
+	InitStuffs(modules)
+	// log.Print("got modules:\n", modules)
+
+	// var low, high int
+	// low, high = Count10000ButtonPresses(modules)
+	// log.Printf("got low %d and high %d\n", low, high)
+
+	// CheckSubgraphsStuff(filename)
+	fmt.Print( AllMermaidFlowChard(modules) )
+
+	var result int
+	// result = CalcCommonStep()
+
+	return result
+}
+
+func CheckSubgraphsStuff(filename string) {
+	// loopStarts := allModules["broadcast"].Outputs()
+
+	// loop start and loop sink
+	loopItems := map[string]string {
+		"sr": "xn",
+		"ch": "xf",
+		"hd": "qn",
+		"bx": "zl",
+	}
+
+	for start, end := range loopItems {
+		allModules := ReadModules(filename)
+		InitStuffs(allModules)
+
+		log.Printf(">>> searching for loop of %s", start)
+		themap := make(map[string]any)
+		loopModules := TransitiveOutputs(start, allModules, themap)
+		// i think my bug is not to reset state of `allModules`
+		_, _, requestedPulses := FindSubGraphLoopLength(loopModules, allModules, end)
+		FilterMonitoredPulses(requestedPulses)
+		log.Printf("the pulses: +%v", requestedPulses)
+	}
+
+	// yeah. and now all cycles start from 1 (first button press)
+	// and then they emit the [high low] on last step of their cycle
+	// so just LCM of these all
+}
+
+func Count10000ButtonPresses(modules map[string]Module) (lowSignalsCount, highSignalsCount int) {
+	count := 1000
+	type counts struct {
+		low, high int
+		step int
+	}
+	countsAfterState := make(map[string]counts)
+	// after each button press check if reached already known state - cycle is present.
+	// then calculate amount of signals before the loop - how much was on that previous state.
+	// then diff - how much added after the loop
+
+	// for now let's just print the info on loop
+
+	for i := 0; i < count; i++ {
+		if i % 10000 == 0 {
+			log.Println("done button presses: ", i)
+		}
+		stepLow, stepHigh := PropagateButtonPress(modules, i)
+		lowSignalsCount += stepLow
+		highSignalsCount += stepHigh
+		// log.Printf("after step %d low is %d and high is %d", i, lowSignalsCount, highSignalsCount)
+		state := ModulesState(modules)
+
+		prevCounts, found := countsAfterState[state]
+		if found {
+			loopLen := i - prevCounts.step
+
+			log.Printf(">>> found loop. from step %d to step %d. of len %d",
+				prevCounts.step, i, loopLen)
+
+			multiplication := count / loopLen
+
+			lowCountInCycle := lowSignalsCount - prevCounts.low
+			highCountInCycle := highSignalsCount - prevCounts.high
+
+			lowSignalsCount = lowCountInCycle * multiplication
+			highSignalsCount = highCountInCycle * multiplication
+
+			return
+		}
+
+		countsAfterState[state] = counts{stepLow, stepHigh, i}
+	}
+
+	return
+}
+
+func PropagateButtonPress(modules map[string]Module, i int) (lowSignalsCount, highSignalsCount int) {
+	signals := []Signal{{From: "button", To: "broadcast", PulseType: LowPulse}}
+	lowSignalsCount += 1
+
+	for len(signals) > 0 {
+		curSignal := signals[0]
+		signals = signals[1:]
+
+		// log.Printf("%s -%s-> %s", curSignal.From, curSignal.PulseType, curSignal.To)
+
+		receivingModule, found := modules[curSignal.To]
+		if !found {
+			// log.Print(fmt.Sprintf("signal %+v can't find it's recepient\n", curSignal))
+			if curSignal.To == "rx" && curSignal.PulseType == LowPulse {
+				panic(fmt.Sprintf("getting low signal to rx, on step %d", i))
+			}
+			continue
+		}
+
+		newSignals := receivingModule.Receive(curSignal)
+
+		// all newSignals will have same type
+		newSignalsAmount := len(newSignals)
+		if newSignalsAmount > 0 {
+			signals = append(signals, newSignals...)
+			someNewSignal := newSignals[0]
+			if someNewSignal.PulseType == HighPulse {
+				highSignalsCount += newSignalsAmount
+			} else {
+				lowSignalsCount += newSignalsAmount
+			}
+		}
+	}
+
+	return
+}
+
+func PropagateButtonPressWithMonitor(modules map[string]Module, i int, monitorAllOutputsOf string) []PulseType {
+	result := make([]PulseType, 0)
+
+	signals := []Signal{{From: "button", To: "broadcast", PulseType: LowPulse}}
+
+	for len(signals) > 0 {
+		curSignal := signals[0]
+		signals = signals[1:]
+
+		if curSignal.From == monitorAllOutputsOf {
+			result = append(result, curSignal.PulseType)
+		}
+
+		// log.Printf("%s -%s-> %s", curSignal.From, curSignal.PulseType, curSignal.To)
+
+		receivingModule, found := modules[curSignal.To]
+		if !found {
+			// log.Print(fmt.Sprintf("signal %+v can't find it's recepient\n", curSignal))
+			if curSignal.To == "rx" && curSignal.PulseType == LowPulse {
+				panic(fmt.Sprintf("getting low signal to rx, on step %d", i))
+			}
+			continue
+		}
+
+		newSignals := receivingModule.Receive(curSignal)
+
+		// all newSignals will have same type
+		newSignalsAmount := len(newSignals)
+		if newSignalsAmount > 0 {
+			signals = append(signals, newSignals...)
+		}
+	}
+
+	return result
+}
+// process sends single `low pulse` directly to "broadcast"
+
+func ReadModules(filename string) map[string]Module {
+	result := make(map[string]Module)
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Sprint("error reading file: ", filename))
+	}
+
+	text := strings.TrimSpace(string(bytes))
+
+	for _, line := range strings.Split(text, "\n") {
+		switch {
+		case IsLineBroadcast(line):
+			parsed := ParseBroadcast(line)
+			result["broadcast"] = &parsed
+		case IsLineFlipFlop(line):
+			parsed := ParseFlipFlop(line)
+			result[parsed.Name] = &parsed
+		case IsLineConjunction(line):
+			parsed := ParseConjunction(line)
+			result[parsed.Name] = &parsed
+		}
+
+		// log.Println(line)
+	}
+
+	buttonModule := Button{}
+	result["button"] = &buttonModule
+	outputModule := Output{}
+	result["output"] = &outputModule
+
+	return result
+}
+
+func InitStuffs(allModules map[string]Module) {
+	for _, module := range allModules {
+		if conjunction, ok := module.(*Conjunction); ok {
+			conjunction.RegisterInputs(allModules)
+		}
+	}
+
+}
+
+func ModulesState(modules map[string]Module) string {
+	// relying on printing of map values to be ordered by key
+	// https://stackoverflow.com/a/54524991/2788805
+	states := make(map[string]string)
+	for name, module := range modules {
+		states[name] = module.StateSnapshot()
+	}
+
+	return fmt.Sprint(states)
+}
+
+func AllMermaidFlowChard(allModules map[string]Module) (result string) {
+	result = "flowchart TD\n"
+	for _, module := range allModules {
+		result += module.MermaidFlow()
+	}
+
+	return
+}
--- a/day21/example
+++ b/day21/example
@@ -0,0 +1,11 @@
+...........
+.....###.#.
+.###.##..#.
+..#.#...#..
+....#.#....
+.##..S####.
+.##..#...#.
+.......##..
+.##.#.####.
+.##..##.##.
+...........
--- a/day21/example1
+++ b/day21/example1
@@ -0,0 +1,11 @@
+...........
+...........
+...........
+...........
+...........
+.....S.....
+...........
+...........
+...........
+...........
+...........
--- a/day21/notes.org
+++ b/day21/notes.org
@@ -0,0 +1,105 @@
+#+title: Notes
+* part 1
+so we aren't looking for minimal distance.
+but all plots which are end to any path of length 'steps left'
+
+so, i have to follow all possible paths to the end?
+or. length of 6 and all even - because i could be doing <- ->
+but i could be doing loop around that would increase path len by odd number
+
+let's just make direct recursive thing.
+create set of all reachable by n,
+* oh, the part 2.
+i suppose this 'infinite' garden could be managed with my 'neighbors' work with 'out of field'
+fairly easy
+but what about sizes of the maps? are we releasing maps of previous iterations?
+
+maybe if i directly pass references to prev and current,
+and manually set 'prev' to target new it will be collected?
+
+and then elements after these steps <em>26501365</em> would fit into memory?
+** i guess maybe it would help if i had 'fully saturated' field
+as my minimal 'skipping' thing
+** so. store FieldCoord(fieldRow, fieldCol) for fields which were fully saturated at current step.
+
+filter out neighbors, no need to enter fully saturated fields
+
+when counting
+on odd - around the S, on even - with S
+
+but the neighboring fields would potentially (likely?) be in different phases
+
+but i guess they are necessarily in different phases?
+or. if width odd - necessarily
+if width even - then what?
+
+then S is not in the center
+
+my input is 131 chars of width.
+so neighboring are necessarily of different phase.
+could compute phase of (0,0)
+and adjust from that
+** TODO remake 'ReachableBySteps' into 'CountReachableBySteps' returning int
+** TODO make it take 'isInitialCountOdd' - to know phase of {0,0} field
+current phase can be determined by initial phase and current N
+
+if initial count is odd, and now it's odd number, we made even iterations, so (0,0) is in even state
+if initial count is even, and now it's even number, we made even iterations, so (0,0) is in even state
+
+** DONE make neighbors take set of saturated fields
+and not produce points on those fields
+** DONE for field calculate what would be amount of points in each phase
+...........
+.....###.#.
+.###.##..#.
+..#.#...#..
+....#.#....
+.##..S####.
+.##..#...#.
+.......##..
+.##.#.####.
+.##..##.##.
+...........
+*** getting 39 and 42
+let's check
+42 is even?
+*** hmmm
+EOEOEOEOEOE
+OEOEO###O#O
+E###E##OE#E
+OE#E#EOE#EO
+EOEO#O#OEOE
+O##EOE####O
+E##OE#EOE#E
+OEOEOEO##EO
+E##O#O####E
+O##EO##E##O
+EOEOEOEOEOE
+*** yes, sounds good
+
+
+** CANCELLED after getting all new points. get coords of all fields we're working on.
+( there already should be no points in saturated fields )
+for each such field, check if it is saturated.
+
+- can be done by comparing the phase with amount of points on saturated
+
+if field saturated - add the coord into set
+and remove all the points
+** CANCELLED on the last step, when n is 0
+return len(startingAt) + (all saturated fields) * (amount of elems in their phase)
+**  calculating points in even 7356 and odd 7321 phases
+* so need to scrap things and do a more analytics approach.
+no blocks on horizontal & vertical from (S)
+meaning diamond expands to left & right well
+* 26501365 = 202300 * 131 + 65 where 131 is the dimension of the grid
+* if there is a formula A*i^2 + B*i + C = D
+where i is full iteration
+* for initial steps :
+2023/12/21 13:25:23 after steps 65. full iter 0. got count 3701
+2023/12/21 13:25:24 after steps 196. full iter 1. got count 33108
+2023/12/21 13:25:27 after steps 327. full iter 2. got count 91853
+2023/12/21 13:25:42 after steps 458. full iter 3. got count 179936
+
+* https://www.dcode.fr/newton-interpolating-polynomial
+14669x^2 + 14738*x+3701
--- a/day21/stepCounter.go
+++ b/day21/stepCounter.go
@@ -0,0 +1,211 @@
+package day21
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func Run() int {
+	fmt.Print("hello day21")
+	filename := "day21/input"
+	field := ReadField(filename)
+	log.Print(field)
+
+	// for i := 6; i <= 10; i++ {
+	// 	reachableBySteps := field.ReachableBySteps(i, map[Coord]any{
+	// 		Coord{Row: field.RowStart, Col: field.ColStart}: struct{}{},
+	// 	})
+
+	// 	log.Print("reachable after steps : ", i, len(reachableBySteps))
+	// 	field.PrintCoord(reachableBySteps, 1)
+	// }
+
+	// initialSolutions := make(map[int]int)
+
+	// for fullIter := 0; fullIter < 4; fullIter++ {
+	// 	steps := 65 + fullIter * 131
+	// 	reachableBySteps := field.ReachableBySteps(steps, map[FieldPoint]any{
+	// 		FieldPoint{
+	// 			InField: Coord{Row: field.RowStart, Col: field.ColStart},
+	// 		}: struct{}{},
+	// 	})
+	// 	log.Printf("after steps %d. full iter %d. got count %d", steps, fullIter, len(reachableBySteps))
+	// 	initialSolutions[fullIter] = len(reachableBySteps)
+	// }
+
+	log.Println("will try to use the values to get coeff of Ax^2 + Bx + C = 0")
+	log.Println("then solve for x == 202300")
+	// f(x) = 14714x^2 + 14603x + 3791
+	// no.
+	// 14669x^2 + 14738*x+3701
+
+	x := 202300
+	result := 14669*x*x + 14738*x+3701
+	
+
+	return result
+}
+
+// let's do dijkstra?
+// i would need lots of space for edges?
+// let's use a map with minimal distances?
+// OR. just breath first traversal
+
+type Field struct {
+	RowStart, ColStart int
+	symbols            [][]rune
+}
+
+type Coord struct {
+	Row, Col int
+}
+
+type FieldPoint struct {
+	InField   Coord
+	MetaField Coord
+}
+
+func (f Field) ReachableBySteps(n int, startingAt map[FieldPoint]any) map[FieldPoint]any {
+	if n%100 == 0 {
+		log.Println("going step: ", n)
+	}
+	if n == 0 {
+		return startingAt
+	}
+	// else collect directly available
+
+	oneStepExpanded := make(map[FieldPoint]any)
+	for cur := range startingAt {
+		for _, neighbor := range f.Neighbors(cur) {
+			oneStepExpanded[neighbor] = struct{}{}
+		}
+	}
+
+	// if n < 4 {
+	// 	log.Print("reachable after steps : ", n, len(oneStepExpanded))
+	// 	f.PrintCoord(oneStepExpanded, 5)
+	// }
+
+	return f.ReachableBySteps(n-1, oneStepExpanded)
+}
+
+func (f Field) Neighbors(c FieldPoint) (resut []FieldPoint) {
+	closeCoords := []FieldPoint{
+		{InField: Coord{Row: c.InField.Row + 1, Col: c.InField.Col}, MetaField: c.MetaField},
+		{InField: Coord{Row: c.InField.Row - 1, Col: c.InField.Col}, MetaField: c.MetaField},
+		{InField: Coord{Row: c.InField.Row, Col: c.InField.Col + 1}, MetaField: c.MetaField},
+		{InField: Coord{Row: c.InField.Row, Col: c.InField.Col - 1}, MetaField: c.MetaField},
+	}
+
+	for i, close := range closeCoords {
+		height := len(f.symbols)
+		width := len(f.symbols[0])
+		if close.InField.Row == height {
+			close.InField.Row = 0
+			close.MetaField.Row += 1
+		}
+		if close.InField.Row == -1 {
+			close.InField.Row = height - 1
+			close.MetaField.Row -= 1
+		}
+		if close.InField.Col == width {
+			close.InField.Col = 0
+			close.MetaField.Col += 1
+		}
+		if close.InField.Col == -1 {
+			// log.Printf("moving COL to lefter field from %d to %d", close.Col, width-1)
+			close.InField.Col = width - 1
+			close.MetaField.Col -= 1
+		}
+		closeCoords[i] = close
+		// but this is not it. i need to store the XX and YY
+		// so that points in other 'fields' would count separately. yuk
+	}
+
+	for _, close := range closeCoords {
+		if f.ValidCoord(close.InField.Row, close.InField.Col) {
+			symb := f.symbols[close.InField.Row][close.InField.Col]
+			if symb == '.' || symb == 'S' {
+				resut = append(resut, close)
+
+			}
+
+		}
+	}
+
+	// log.Print("getting neighbors for ", c, resut)
+
+	return
+}
+
+func (f Field) ValidCoord(row, col int) bool {
+	// log.Print("check valid ", row, col, row >= 0 && row < len(f.symbols) && col >= 0 && col < len(f.symbols[0]))
+
+	valid := row >= 0 && row < len(f.symbols) && col >= 0 && col < len(f.symbols[0])
+	if !valid {
+		panic(fmt.Sprint("getting invalid coord: ", row, col))
+	}
+	return valid
+}
+
+func (f Field) String() (result string) {
+	result += "\n"
+	for _, line := range f.symbols {
+		result += string(line)
+		result += "\n"
+	}
+
+	return
+}
+
+func ReadField(filename string) (result Field) {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+	text := strings.TrimSpace(string(bytes))
+
+	lines := strings.Split(text, "\n")
+	rows := make([][]rune, len(lines))
+	for rowNum, line := range lines {
+		rows[rowNum] = []rune(line)
+		for colNum, symb := range line {
+			if symb == 'S' {
+				result.RowStart = rowNum
+				result.ColStart = colNum
+			}
+		}
+	}
+	result.symbols = rows
+	return
+}
+
+func (f Field) PrintCoord(coords map[FieldPoint]any, expandByField int) {
+
+	for fieldRow := -expandByField; fieldRow <= expandByField; fieldRow++ {
+		lines := make([]string, len(f.symbols))
+		for fieldCol := -expandByField; fieldCol <= expandByField; fieldCol++ {
+
+			for rowNum, row := range f.symbols {
+				for colNum, col := range row {
+					_, marked := coords[FieldPoint{InField: Coord{Row: rowNum, Col: colNum},
+						MetaField: Coord{Row: fieldRow, Col: fieldCol}}]
+					if marked {
+						lines[rowNum] += "O"
+					} else {
+						lines[rowNum] += string(col)
+					}
+				}
+			}
+
+		}
+		for _, line := range lines {
+			fmt.Println(line)
+		}
+
+	}
+
+	return
+}
--- a/day22/block.go
+++ b/day22/block.go
@@ -0,0 +1,104 @@
+package day22
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+	"github.com/deckarep/golang-set/v2"
+)
+
+type XY struct {
+	X, Y uint
+}
+
+type Block struct {
+	NameNum     int
+	XMin, XMax  uint
+	YMin, YMax  uint
+	Z           uint
+	IsSettled   bool
+	ZHeight     uint
+	Supports    mapset.Set[*Block]
+	SupportedBy mapset.Set[*Block]
+}
+
+func (b *Block) String() string {
+	return fmt.Sprintf("[Block %d - x:%d-%d, y:%d-%d, z:%d, h:%d, isSettled %t]",
+		b.NameNum, b.XMin, b.XMax, b.YMin, b.YMax, b.Z, b.ZHeight, b.IsSettled)
+}
+
+func AtoIOrPanic(a string) int {
+	n, err := strconv.Atoi(a)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func ReadBlock(line string, num int) (b Block) {
+	b.NameNum = num
+	re := regexp.MustCompile(`(\d+),(\d+),(\d+)~(\d+),(\d+),(\d+)`)
+	matches := re.FindStringSubmatch(line)
+
+	x1, x2 := AtoIOrPanic(matches[1]), AtoIOrPanic(matches[4])
+	y1, y2 := AtoIOrPanic(matches[2]), AtoIOrPanic(matches[5])
+	z1, z2 := AtoIOrPanic(matches[3]), AtoIOrPanic(matches[6])
+
+	b.XMax = uint(max(x1, x2))
+	b.XMin = uint(min(x1, x2))
+	b.YMax = uint(max(y1, y2))
+	b.YMin = uint(min(y1, y2))
+	b.Z = uint(min(z1, z2))
+	b.ZHeight = uint(max(z1, z2)) - b.Z
+
+	b.Supports = mapset.NewSet[*Block]()
+	b.SupportedBy = mapset.NewSet[*Block]()
+
+	return
+}
+
+func (b *Block) getXY() (coords []XY) {
+	for x := b.XMin; x <= b.XMax; x++ {
+		for y := b.YMin; y <= b.YMax; y++ {
+			coords = append(coords, XY{X: x, Y: y})
+		}
+	}
+
+	return
+}
+
+func ReadBlockFile(filename string) (blocks []*Block) {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+
+	text := strings.TrimSpace(string(bytes))
+	for i, line := range strings.Split(text, "\n") {
+		block := ReadBlock(line, i)
+		blocks = append(blocks, &block)
+	}
+
+	return
+}
+
+func BlocksByZ(blocks []*Block) [][]*Block {
+	maxZ := uint(0)
+	for _, block := range blocks {
+		if block.Z > maxZ {
+			maxZ = block.Z
+		}
+	}
+	log.Print("found max z: ", maxZ)
+
+	result := make([][]*Block, maxZ+1)
+
+	for _, block := range blocks {
+		result[block.Z] = append(result[block.Z], block)
+	}
+
+	return result
+}
--- a/day22/block_test.go
+++ b/day22/block_test.go
@@ -0,0 +1,37 @@
+package day22
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestReadBlock(t *testing.T) {
+	lines := `1,0,1~1,2,1
+0,0,2~2,0,2
+0,2,3~2,2,3
+0,0,4~0,2,4
+2,0,5~2,2,5
+0,1,6~2,1,6
+1,1,8~1,1,9`
+
+	for _, line := range strings.Split(lines, "\n") {
+		b := ReadBlock(line, 0)
+		t.Logf("read %s into block %+v", line, b)
+		t.Logf("XY coords for %+v are : %+v", b, b.getXY())
+	}
+}
+
+func TestReadFile(t *testing.T) {
+	filename := "example"
+	// filename := "input"
+	blocks := ReadBlockFile(filename)
+
+	byZ := BlocksByZ(blocks)
+	for z, zBlocks := range byZ {
+		zBlocksLine := ""
+		for _, block := range zBlocks {
+			zBlocksLine += block.String()
+		}
+		t.Logf("for level %d blocks %+v", z, zBlocksLine)
+	}
+}
--- a/day22/example
+++ b/day22/example
@@ -0,0 +1,7 @@
+1,0,1~1,2,1
+0,0,2~2,0,2
+0,2,3~2,2,3
+0,0,4~0,2,4
+2,0,5~2,2,5
+0,1,6~2,1,6
+1,1,8~1,1,9
--- a/day22/notes.org
+++ b/day22/notes.org
@@ -0,0 +1,76 @@
+#+title: Notes
+* ok. let's try this.
+i'd want to have block type
+with function to get it's XY coords
+
+i'd want to settle blocks first.
+but if i store enough data, for example block.supports slice i'll be able to anser first task.
+
+(settledOnZ) i would want [][]*Block per level from 0 to up. with references to blocks that settled on that level
+
+(maxSettledXY) and for going from 0 up i'll want XY of the top block settled with it's level. i guess i could store settled level in the block as well
+
+then for settling blocks, i will need (sorted map if data is sparse?) go from 0 up,
+order of processing for blocks on same z level is not important.
+for each block get it's XY, check maxSettledXY if there's a block check it's Z,
+for all block XY coords, find maximal settled Z, and refs to all blocks that are directly under with that same Z.
+
+for the block set settledZ to Z+1, and for all those blocks add the block to 'supports'
+add block to settledOnZ[Z+1]
+
+for the second part, i can scan all the blocks, don't even need the settledOnZ, just check if it's 'supports' is empty
+
+** DONE block type
+store z, and have 'settledZ', maybe with default -1?
+** DONE coords type, func to get XY coords of the block
+** DONE now i guess what? do i want a sorted map? or just map from height to blocks on that hight?
+let's read file, and calc max height present?
+i suppose funciton to read file could also be initially entered via test, right?
+** DONE now go through the z levels, block by block, doing setting.
+i suppose i could organize setting methods around Space?
+it will store (settledOnZ) and (maxSettledOnXY)
+** DONE [#A] when i settle single block. the maxSettledOnXY - should use (z + height)
+** i can already imagine secon part? what is the most volume that can be disintegrated? or what? most volume is just all
+* part 1, wrong answer.
+i guess try to go, setting the input? block after block and try to check the calculations?
+
+what i want to check:
+how maxSettledOnXY works, how linking works. maybe i'll find a problem in few steps =C
+** can't see anything just glancing around.
+maybe then trying to pick a block and track what's under it?
+* ok. let's try to brute force?
+for each block, remove it?
+create new space and try to settle it
+** this is shit. why blocks move up?
+2023/12/22 12:12:24 >>> starting for block [Block 1 - x:0-2, y:0-0, z:1, h:0, isSettled true] (supports [[Block 3 - x:0-0, y:0-2, z:3, h:0, isSettled true] [Block 4 - x:2-2, y:0-2, z:3, h:0, isSettled true] [Block 3 - x:0-0, y:0-2, z:2, h:0, isSettled true] [Block 4 - x:2-2, y:0-2, z:2, h:0, isSettled true]])
+2023/12/22 12:12:24 block [Block 2 - x:0-2, y:2-2, z:2, h:0, isSettled true] moved from 1 to 2
+2023/12/22 12:12:24 block [Block 3 - x:0-0, y:0-2, z:3, h:0, isSettled true] moved from 2 to 3
+2023/12/22 12:12:24 block [Block 4 - x:2-2, y:0-2, z:3, h:0, isSettled true] moved from 2 to 3
+2023/12/22 12:12:24 block [Block 5 - x:0-2, y:1-1, z:4, h:0, isSettled true] moved from 3 to 4
+2023/12/22 12:12:24 block [Block 6 - x:1-1, y:1-1, z:5, h:1, isSettled true] moved from 4 to 5
+2023/12/22 12:12:24 for block [Block 1 - x:0-2, y:0-0, z:1, h:0, isSettled true] new space has 5 moved
+* ok. brute force with copying slices worked.
+now i want to debug.
+
+for each brick, when there is 0 falling, i want to check what are it's surroundings
+** my initial was : 567
+** checking example of badly determined:
+>> for block [Block 291 - x:6-8, y:7-7, z:75, h:0, isSettled false]
+checking under coord {X:6 Y:7}. found under [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]. ( 'overriding' ) with 35 ; maxZ 35
+ directly supporting blocks are [[Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]]
+checking under coord {X:7 Y:7}. found under [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]. ( 'adding' ) with 35 ; maxZ 35
+ directly supporting blocks are [[Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true] [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]]
+checking under coord {X:8 Y:7}. found under [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]. ( 'adding' ) with 35 ; maxZ 35
+ directly supporting blocks are [[Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true] [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true] [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]]
+>> after settring block [Block 291 - x:6-8, y:7-7, z:36, h:0, isSettled true]. supported by [[Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true] [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true] [Block 698 - x:6-8, y:7-7, z:35, h:0, isSettled true]]
+** ouch. duplicates in slices. because there's no easy set thingy
+not doing this was my bug.
+
+#+begin_src go
+slices.SortFunc(block.SupportedBy, func(a *Block, b *Block) int {
+    return cmp.Compare(a.NameNum, b.NameNum)
+})
+block.SupportedBy = slices.Compact(block.SupportedBy)
+#+end_src
+* maybe rewrite with Set?
+* should have done that from the start
--- a/day22/printingSpace.go
+++ b/day22/printingSpace.go
@@ -0,0 +1,38 @@
+package day22
+
+import (
+	"math"
+
+	"github.com/tidwall/pinhole"
+)
+
+func TestPinhole() {
+	p := pinhole.New()
+	p.DrawCube(-0.3, -0.3, -0.3, 0.3, 0.3, 0.3)
+	p.Rotate(math.Pi/3, math.Pi/2, 0)
+	p.SavePNG("cube.png", 500, 500, nil)
+}
+
+func PrintSpace(s Space, filename string) {
+	// pinhole is from -1 to 1. let's use from 0 to 1.
+	// so coord should be divided by max height, and let's hope that they are not too wide
+
+	rotation := []float64{math.Pi/3, math.Pi/6, 0}
+
+	p := pinhole.New()
+
+	p.DrawRect(-1, -1, 1, 1, 0)
+
+	for _, zLevel := range s.SettledOnZ {
+		for _, block := range zLevel {
+			p.DrawCube(float64(block.XMin) / float64(s.MaxZ),
+				float64(block.YMin) / float64(s.MaxZ),
+				float64(block.Z) / float64(s.MaxZ),
+				float64(block.XMax + 1) / float64(s.MaxZ),
+				float64(block.YMax + 1) / float64(s.MaxZ),
+				float64(block.Z + block.ZHeight + 1) / float64(s.MaxZ))
+		}
+	}
+	p.Rotate(rotation[0], rotation[1], rotation[2])
+	p.SavePNG(filename, 1920, 1080, nil)
+}
--- a/day22/sandSlabs.go
+++ b/day22/sandSlabs.go
@@ -0,0 +1,18 @@
+package day22
+
+import (
+	"fmt"
+)
+
+func Run() int {
+	fmt.Print("oi, hello day 22")
+	filename := "day22/input"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+	space.SettleAll()
+
+	result := space.CountFreeBlocks()
+	return result
+}
--- a/day22/space.go
+++ b/day22/space.go
@@ -0,0 +1,206 @@
+package day22
+
+import (
+	"log"
+	"slices"
+)
+
+type Space struct {
+	MaxZ           uint
+	SettledOnZ     [][]*Block
+	MaxSettledOnXY map[XY]*Block
+	UnsettledByZ   [][]*Block
+}
+
+func NewSpace(blocksByZ [][]*Block) Space {
+	return Space{
+		UnsettledByZ:   blocksByZ,
+		MaxZ:           uint(len(blocksByZ) - 1),
+		MaxSettledOnXY: make(map[XY]*Block),
+		SettledOnZ:     make([][]*Block, len(blocksByZ)),
+	}
+}
+
+func (s *Space) AgainCountFreeBlocks() (result int) {
+	for _, row := range s.SettledOnZ {
+		for _, block := range row {
+			thisSupports := block.Supports
+			canDisintegrate := true
+			for blockThisSupports := range thisSupports.Iter() {
+				if blockThisSupports.SupportedBy.Cardinality() == 1 {
+					// we cannot disintigrate this block
+					canDisintegrate = false
+				}
+			}
+			if canDisintegrate {
+				result += 1
+			}
+		}
+	}
+	return
+}
+
+func (s *Space) InitialCollectGoodToDisintegrate() (result []Block) {
+	allBlocks := make(map[*Block]any)
+
+	for _, row := range s.SettledOnZ {
+		for _, block := range row {
+			allBlocks[block] = struct{}{}
+			if block.SupportedBy.Cardinality() == 1 {
+				onlySupport, _ := block.SupportedBy.Pop()
+				log.Printf("in block %+v. only support is %+v", block, onlySupport)
+				log.Printf("should be NOT OK to remove %+v", onlySupport)
+				delete(allBlocks, onlySupport)
+			}
+		}
+	}
+
+	for block := range allBlocks {
+		result = append(result, *block)
+	}
+
+	return
+}
+
+func (s *Space) CountFreeBlocks() (result int) {
+	return len(s.InitialCollectGoodToDisintegrate())
+}
+
+func (s *Space) ThirdTimeCollectGoodToDisintegrate() (blocks []Block) {
+	// for each block create a new space without it. try to settle and check if 0 moved
+	log.Println(">>>>> starting hardcode count <<<<<")
+	for rowNum, row := range s.SettledOnZ {
+		for blockNum, block  := range row {
+			// log.Printf(">>> starting for block %+v (supports %+v)\n", block, block.Supports)
+			newUnsettled := slices.Clone(s.SettledOnZ)
+			for rowNum, row := range newUnsettled {
+				newUnsettled[rowNum] = slices.Clone(row)
+			}
+			newUnsettled[rowNum] = slices.Delete(newUnsettled[rowNum], blockNum, blockNum+1)
+			// and now copy the blocks 
+			for rowNum, row := range newUnsettled {
+				for blockNum, block := range row {
+					newBlock := *block
+					newUnsettled[rowNum][blockNum] = &newBlock
+				}
+			}
+			
+			newSpace := NewSpace(newUnsettled)
+			moved := newSpace.SettleAll()
+			if moved > 0 {
+				// log.Printf("for block %+v new space has %d moved\n\n", block, moved)
+			} else {
+				// log.Printf("for block %+v new space has %d moved\n\n", block, moved)
+				blocks = append(blocks, *block)
+			}
+		}
+	}
+
+	return
+}
+
+func (s *Space) ThirdTimeCountFreeBlocks() (result int) {
+	return len(s.ThirdTimeCollectGoodToDisintegrate())
+}
+
+func (s *Space) CountChainReactoins() (result int) {
+	for rowNum, row := range s.SettledOnZ {
+		for blockNum, _  := range row {
+			newUnsettled := slices.Clone(s.SettledOnZ)
+			for rowNum, row := range newUnsettled {
+				newUnsettled[rowNum] = slices.Clone(row)
+			}
+			newUnsettled[rowNum] = slices.Delete(newUnsettled[rowNum], blockNum, blockNum+1)
+			// and now copy the blocks 
+			for rowNum, row := range newUnsettled {
+				for blockNum, block := range row {
+					newBlock := *block
+					newUnsettled[rowNum][blockNum] = &newBlock
+				}
+			}
+			
+			newSpace := NewSpace(newUnsettled)
+			moved := newSpace.SettleAll()
+			result += moved
+		}
+	}
+
+	return
+}
+
+func (s *Space) SettleAll() (totalMoved int) {
+	for i := uint(1); i <= s.MaxZ; i++ {
+		movedAfterLayer := s.SettleZ(i)
+		totalMoved += movedAfterLayer
+	}
+	return
+}
+
+// settle all blocks in Z, remove Z from UnsettledByZ
+func (s *Space) SettleZ(z uint) (totalMoved int) {
+	blocksToSettle := s.UnsettledByZ[int(z)]
+
+	for _, block := range blocksToSettle {
+		hasMoved := s.SettleBlock(block)
+		if hasMoved {
+			totalMoved += 1
+		}
+	}
+
+	s.UnsettledByZ[int(z)] = nil
+	return
+}
+
+// for the block:
+// check all XY in MaxSettledOnXY
+// if there are any settled blocks on these XY, find max of their Z
+// for all blocks with that Z - add block to their 'supports'
+// set Z for block to Z+1, settled to true
+// add block as highest settled for all the XY
+// add block to MaxSettledOnXY
+func (s *Space) SettleBlock(block *Block) (hasMoved bool) {
+	initialZ := block.Z
+	underZMax := uint(0)
+	underZBlocks := make([]*Block, 0)
+	// fmt.Printf("\n>> for block %s\n", block)
+	for _, xy := range block.getXY() {
+		underBlock, found := s.MaxSettledOnXY[xy]
+		// if block.NameNum
+		if found {
+			underBlockMaxZ := underBlock.Z + underBlock.ZHeight
+			// action := " 'skipping' "
+			if underBlockMaxZ > underZMax {
+				underZBlocks = []*Block{underBlock}
+				underZMax = underBlockMaxZ
+				// action = " 'overriding' "
+			} else if underBlockMaxZ == underZMax {
+				underZBlocks = append(underZBlocks, underBlock)
+				// action = " 'adding' "
+			}
+			// fmt.Printf("checking under coord %+v. found under %+v. (%s) with %d ; maxZ %d\n directly supporting blocks are %+v\n",
+			// 	xy, underBlock, action, underBlockMaxZ, underZMax, underZBlocks)
+		} else {
+			// fmt.Printf("checking under coord %+v. nothing under\n", xy)
+		}
+		s.MaxSettledOnXY[xy] = block
+	}
+
+	for _, settledUnderblock := range underZBlocks {
+		settledUnderblock.Supports.Add(block)
+		block.SupportedBy.Add(settledUnderblock)
+
+	}
+
+	block.Z = underZMax + 1
+	block.IsSettled = true
+
+	s.SettledOnZ[block.Z] = append(s.SettledOnZ[block.Z], block)
+	// fmt.Printf(">> after settring block %s. supported by %+v\n\n", block, block.SupportedBy)
+
+	// time.Sleep(500 * time.Millisecond)
+	hasMoved = initialZ != block.Z
+	// if hasMoved {
+	// 	log.Printf("block %+v moved from %d to %d", block, initialZ, block.Z)
+	// }
+	return 
+}
--- a/day22/space_test.go
+++ b/day22/space_test.go
@@ -0,0 +1,135 @@
+package day22
+
+import (
+	"slices"
+	"testing"
+)
+
+func TestSpaceSettleSingle(t *testing.T) {
+	filename := "example"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+	t.Logf("read space %+v", space)
+
+	block := blocks[2]
+	t.Logf("block before setting %+v", block)
+	space.SettleBlock(block)
+	t.Logf("space after settings %+v:\n%+v", block, space)
+}
+
+func TestSpaceSettleSecondNearby(t *testing.T) {
+	filename := "example"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+	t.Logf("read space %+v", space)
+
+	block1 := blocks[0]
+	block2 := blocks[3]
+	t.Logf("block 1 before setting %+v", block1)
+	space.SettleBlock(block1)
+	t.Logf("space after settling block 1 %+v", space)
+	t.Logf("block 2 before setting %+v", block2)
+	space.SettleBlock(block2)
+	t.Logf("space after settling block 2 %+v", space)
+	t.Logf("space after settling %+v", space)
+}
+
+func TestSpaceSettleThirdOnTopFirst(t *testing.T) {
+	filename := "example"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+	t.Logf("read space %+v", space)
+
+	block1 := blocks[0]
+	block2 := blocks[3]
+	block3 := blocks[2] // should overlap X & Y coords of block 1
+	t.Logf("block 1 before setting %+v", block1)
+	space.SettleBlock(block1)
+	t.Logf("space after settling block 1 %+v", space)
+	t.Logf("block 2 before setting %+v", block2)
+	space.SettleBlock(block2)
+	t.Logf("space after settling block 2 %+v", space)
+	t.Logf("block 3 before setting %+v", block3)
+	space.SettleBlock(block3)
+	t.Logf("space after settling block 3 %+v", space)
+	t.Logf("space after settling %+v", space)
+
+	t.Logf("blocks 1 & 3 should support it: %+v , %+v", block1.Supports, block2.Supports)
+	// because block 3 is 0-2, 2-2
+	// and that overlaps 1-1, 0-2 AND 0-0, 0-2
+	t.Logf("other blocks should not supt %+v", block3.Supports)
+}
+
+func TestSpaceExampleSettleAll(t *testing.T) {
+	filename := "example"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+	space.SettleAll()
+
+	t.Logf("settled space %+v", space)
+
+	// maybe i can check via console.
+	i := 2
+	t.Logf("level %d is : %+v", i, space.SettledOnZ[i])
+	// it looks ok for the example.
+	// let's hope?
+
+	t.Logf("for example, free blocks amount is %d", space.CountFreeBlocks())
+	// oh, i need 'supported'?
+	// how do i need to count the task question
+	// i guess we can start with set of all blocks, then?
+	// run over all, if some block is only supported by some underBlock - remove that underblock
+}
+
+func TestPinholeStart(t *testing.T) {
+	TestPinhole()
+}
+
+func TestExampleSpacePrint(t *testing.T) {
+	filename := "example"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+
+	// PrintSpace(space, "before-settping.png")
+
+	space.SettleAll()
+
+	PrintSpace(space, "after-settping.png")
+
+}
+
+func TestCompareInitialAndBruteforce(t *testing.T) {
+	filename := "input"
+	blocks := ReadBlockFile(filename)
+	byZ := BlocksByZ(blocks)
+
+	space := NewSpace(byZ)
+
+	space.SettleAll()
+
+	initialBlocks := space.InitialCollectGoodToDisintegrate()
+	correct := space.ThirdTimeCollectGoodToDisintegrate()
+
+	t.Log("len of initial solution : ", len(initialBlocks))
+	t.Log("len of correct solution : ", len(correct))
+
+	for _, disintegratableInInitial := range initialBlocks {
+		indexInCorrect := slices.IndexFunc(correct, func(e Block) bool {
+			return e.NameNum == disintegratableInInitial.NameNum
+		})
+		if indexInCorrect == -1 {
+			t.Logf("> found %+v. falsly marked as disintegratable\n\n", disintegratableInInitial)
+		}
+
+	}
+}
--- a/day23/aLongWalk.go
+++ b/day23/aLongWalk.go
@@ -0,0 +1,26 @@
+package day23
+
+import (
+	"fmt"
+)
+
+// length of longest scenic route
+func Run() int {
+	fmt.Println("day 23")
+	max := 0
+	filename := "day23/input"
+	field := ReadField(filename)
+	fmt.Println(field.SparseString())
+	// finalPaths := RunDFSTingy(field)
+	// // log.Println(finalPaths)
+
+	// for _, path := range finalPaths {
+	// 	if path.Visited.Cardinality() > max {
+	// 		log.Println("one path len is ", path.Visited.Cardinality())
+	// 		max = path.Visited.Cardinality()
+	// 	}
+	// }
+
+	return max
+}
+
--- a/day23/example
+++ b/day23/example
@@ -0,0 +1,23 @@
+#.#####################
+#.......#########...###
+#######.#########.#.###
+###.....#.>.>.###.#.###
+###v#####.#v#.###.#.###
+###.>...#.#.#.....#...#
+###v###.#.#.#########.#
+###...#.#.#.......#...#
+#####.#.#.#######.#.###
+#.....#.#.#.......#...#
+#.#####.#.#.#########v#
+#.#...#...#...###...>.#
+#.#.#v#######v###.###v#
+#...#.>.#...>.>.#.###.#
+#####v#.#.###v#.#.###.#
+#.....#...#...#.#.#...#
+#.#########.###.#.#.###
+#...###...#...#...#.###
+###.###.#.###v#####v###
+#...#...#.#.>.>.#.>.###
+#.###.###.#.###.#.#v###
+#.....###...###...#...#
+#####################.#
--- a/day23/example2
+++ b/day23/example2
@@ -0,0 +1,10 @@
+#.#####################
+#.#####################
+#.##............#######
+#.##.##########.#######
+#....##########.#######
+####..#########.#######
+#####...........#######
+###############.#######
+###############.#######
+###############.#######
--- a/day23/field.go
+++ b/day23/field.go
@@ -0,0 +1,175 @@
+package day23
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+type Coord struct {
+	Row, Col int
+}
+
+type CellType rune
+
+const (
+	Path       CellType = '.'
+	Tree       CellType = '#'
+	SlideDown  CellType = 'v'
+	SlideUp    CellType = '^'
+	SlideLeft  CellType = '<'
+	SlideRight CellType = '>'
+)
+
+type Field struct {
+	MaxRow, MaxCol   int
+	Cells            map[Coord]CellType
+	StartCol, EndCol int
+}
+
+func (f *Field) EndCoord() Coord {
+	return Coord{Row: f.MaxRow, Col: f.EndCol}
+}
+
+func (f *Field) NeighborsPart2(c Coord) (neighbors []Coord) {
+	symb, exists := f.Cells[c]
+	if !exists {
+		panic(fmt.Sprintf("coord %+v not found in field", c))
+	}
+
+	var coords []Coord
+	switch symb {
+	case Tree:
+		panic(fmt.Sprintf("attempting to get neighbors of a tree at %+v", c))
+	default:
+		coords = []Coord{
+			{Row: c.Row + 1, Col: c.Col},
+			{Row: c.Row - 1, Col: c.Col},
+			{Row: c.Row, Col: c.Col + 1},
+			{Row: c.Row, Col: c.Col - 1},
+		}
+	}
+
+	for _, coord := range coords {
+		neighborSymb, found := f.Cells[coord]
+		if !found || neighborSymb == Tree {
+			continue
+		}
+		neighbors = append(neighbors, coord)
+	}
+	return
+}
+
+func (f *Field) Neighbors(c Coord) (neighbors []Coord) {
+	symb, exists := f.Cells[c]
+	if !exists {
+		panic(fmt.Sprintf("coord %+v not found in field", c))
+	}
+
+	var coords []Coord
+	switch symb {
+	case Path:
+		coords = []Coord{
+			{Row: c.Row + 1, Col: c.Col},
+			{Row: c.Row - 1, Col: c.Col},
+			{Row: c.Row, Col: c.Col + 1},
+			{Row: c.Row, Col: c.Col - 1},
+		}
+	case Tree:
+		panic(fmt.Sprintf("attempting to get neighbors of a tree at %+v", c))
+	case SlideDown:
+		coords = []Coord{{Row: c.Row + 1, Col: c.Col}}
+	case SlideUp:
+		coords = []Coord{{Row: c.Row - 1, Col: c.Col}}
+	case SlideLeft:
+		coords = []Coord{{Row: c.Row, Col: c.Col - 1}}
+	case SlideRight:
+		coords = []Coord{{Row: c.Row, Col: c.Col + 1}}
+	}
+
+	for _, coord := range coords {
+		neighborSymb, found := f.Cells[coord]
+		if !found || neighborSymb == Tree {
+			continue
+		}
+		neighbors = append(neighbors, coord)
+	}
+	return
+}
+
+func (f *Field) String() (result string) {
+	result += "\n"
+	for row := 0; row <= f.MaxRow; row++ {
+		for col := 0; col <= f.MaxCol; col++ {
+			if row == 0 && col == f.StartCol {
+				result += "S"
+				continue
+			}
+			if row == f.MaxRow && col == f.EndCol {
+				result += "E"
+				continue
+			}
+
+			symb := f.Cells[Coord{Row: row, Col: col}]
+			result += string(symb)
+		}
+		result += "\n"
+	}
+	return
+}
+
+func (f *Field) SparseString() (result string) {
+	result += "\n"
+	for row := 0; row <= f.MaxRow; row++ {
+		for col := 0; col <= f.MaxCol; col++ {
+			if row == 0 && col == f.StartCol {
+				result += "S"
+				continue
+			}
+			if row == f.MaxRow && col == f.EndCol {
+				result += "E"
+				continue
+			}
+
+			symb := f.Cells[Coord{Row: row, Col: col}]
+			if symb != Tree {
+				neighbors := f.NeighborsPart2(Coord{Row: row, Col: col})
+				if len(neighbors) > 2 {
+					result += "o"
+				} else {
+					result += "."
+				}
+			} else {
+				result += " "
+			}
+		}
+		result += "\n"
+	}
+	return
+}
+
+func ReadField(filename string) (result Field) {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+	lines := strings.Split(strings.TrimSpace(string(bytes)), "\n")
+	result.MaxRow = len(lines) - 1
+	result.MaxCol = len(lines[0]) - 1
+	rows := make(map[Coord]CellType)
+
+	for rowNum, row := range lines {
+		for colNum, symb := range row {
+			rows[Coord{Row: rowNum, Col: colNum}] = CellType(symb)
+			if rowNum == 0 && symb == rune(Path) {
+				result.StartCol = colNum
+			}
+			if rowNum == result.MaxRow && symb == rune(Path) {
+				result.EndCol = colNum
+			}
+		}
+	}
+	result.Cells = rows
+
+	return
+}
--- a/day23/field_test.go
+++ b/day23/field_test.go
@@ -0,0 +1,31 @@
+package day23
+
+import "testing"
+
+func TestReadField(t *testing.T) {
+	filename := "example"
+	field := ReadField(filename)
+	t.Log(field.String())
+}
+
+func TestStartNeighbors(t *testing.T) {
+	filename := "example"
+	field := ReadField(filename)
+	startNeighbors := field.Neighbors(Coord{Row: 0, Col: field.StartCol})
+	t.Log(startNeighbors)
+}
+
+// 5,3
+func TestForkNeighbors(t *testing.T) {
+	filename := "example"
+	field := ReadField(filename)
+	startNeighbors := field.Neighbors(Coord{Row: 5, Col: 3})
+	t.Log(startNeighbors)
+}
+
+func TestSlideNeighbors(t *testing.T) {
+	filename := "example"
+	field := ReadField(filename)
+	startNeighbors := field.Neighbors(Coord{Row: 6, Col: 3})
+	t.Log(startNeighbors)
+}
--- a/day23/graph.go
+++ b/day23/graph.go
@@ -0,0 +1,248 @@
+package day23
+
+import (
+	"fmt"
+	"log"
+	"slices"
+
+	mapset "github.com/deckarep/golang-set/v2"
+)
+
+type Node struct {
+	index int
+	c Coord
+	name string
+}
+func (n Node)Name() string {
+	var r string
+	if n.index < 25 {
+		num := 'A' + n.index
+		r = string(rune(num))
+	} else {
+		num := 'a' + n.index - 25
+		r = string(rune(num))
+	}
+	return r
+}
+
+type Graph struct {
+	nodes map[Coord]Node
+	nodesByIndex []Node
+	edges [][]int // from, to, length. excluding from, including to
+}
+
+func MaxDist(from, to Node) (result int) {
+
+	return
+}
+
+func PrintFieldWithGraph(g Graph, f Field) (result string) {
+	result += "\n"
+	for row := 0; row <= f.MaxRow; row++ {
+		for col := 0; col <= f.MaxCol; col++ {
+			symb := f.Cells[Coord{Row: row, Col: col}]
+			if symb != Tree {
+				coord := Coord{Row: row, Col: col}
+				node, exists := g.nodes[coord]
+				if exists {
+					result += fmt.Sprint(node.Name())
+				} else {
+					result += "."
+				}
+			} else {
+				result += " "
+			}
+		}
+		result += "\n"
+	}
+	return
+}
+
+func CreateGraph(f Field) (g Graph) {
+	startCoord := Coord{Row: 0, Col: f.StartCol}
+	// directly below start
+	initialPath := PathEnd{
+		end: Coord{Row: 1, Col: f.StartCol}, visited: mapset.NewSet[Coord](),
+	}
+
+	g = Graph{
+		nodes: map[Coord]Node{
+			startCoord: Node{
+				index: 0,
+				c: startCoord,
+				name: "A",
+			},
+		},
+	}
+
+	const presumedNodeCount = 36
+	g.edges = make([][]int, presumedNodeCount)
+	for i := 0; i < presumedNodeCount; i++ {
+		g.edges[i] = make([]int, presumedNodeCount)
+	}
+
+	recursiveGraphStep(f, initialPath, &g, startCoord, 1, mapset.NewSet[Coord]())
+	g.edges[0][0] = 0
+
+	g.nodesByIndex = make([]Node, len(g.nodes))
+	for _, node := range g.nodes {
+		g.nodesByIndex[node.index] = node
+	}
+
+	return
+}
+
+func (g *Graph)Neighbors(node Node) (nodes []Node) {
+	index := node.index
+	for toIndex, len := range g.edges[index] {
+		if len > 0 {
+			nodes = append(nodes, g.nodesByIndex[toIndex])
+		}
+	}
+	return
+}
+
+var maxSoFar int = -1
+func CheckMaxSoFar(maybe int) {
+	if maybe > maxSoFar {
+		maxSoFar = maybe
+	}
+}
+
+func (g *Graph) DFSLenOnGraph(atNode Node, visited mapset.Set[int],
+	toNode Node, lenSoFar int) int {
+
+	if atNode == toNode {
+		CheckMaxSoFar(lenSoFar)
+		return lenSoFar
+	}
+	log.Printf("at %+v to %+v cur dist is %d.\t\t|max so far %d| \n", atNode, toNode, lenSoFar, maxSoFar)
+
+	neighbors := g.Neighbors(atNode)
+	toVisit := slices.DeleteFunc(neighbors, func(n Node) bool {
+		return visited.Contains(n.index)
+	})
+
+	if len(toVisit) == 0 {
+		return -1
+	}
+	max := -1
+
+	for _, nextNode := range toVisit {
+		newVisited := visited.Clone()
+		newVisited.Add(atNode.index)
+		dist := g.edges[atNode.index][nextNode.index]
+		maxFromNext := g.DFSLenOnGraph(nextNode, newVisited, toNode, lenSoFar + dist)
+		if maxFromNext > max {
+			max = maxFromNext
+		}
+	}
+
+	return max
+}
+
+// run dfs, remembering from which remembers from which node we go, which path already traversed
+func recursiveGraphStep(f Field, p PathEnd, g *Graph, goingFrom Coord, goingLen int, visitedPathPoints mapset.Set[Coord]) {
+	// log.Printf("entering coord %+v. from %+v with len %d\n", p.end, goingFrom, goingLen)
+
+	// if visitedPathPoints.Contains(p.end) {
+	// 	return
+	// }
+
+	neighbors := f.NeighborsPart2(p.end)
+
+	isCrossRoad := len(neighbors) > 2
+	if isCrossRoad {
+		log.Println("this should be crossroad ", p.end)
+	}
+	isStart := p.end == Coord{Row: 0, Col: f.StartCol}
+	isEnd := p.end == f.EndCoord()
+	if isEnd {
+		log.Println("this should be end ", p.end)
+	}
+
+	isNode := isCrossRoad || isStart || isEnd
+
+	continuedPaths := ExtendPath(p, f)
+
+	if !isNode {
+		// just recurse into next paths, from same node, with increased len
+		visitedPathPoints.Add(p.end)
+		for _, nextStep := range continuedPaths {
+			recursiveGraphStep(f, nextStep, g, goingFrom, goingLen+1, visitedPathPoints)
+		}
+	} else {
+		node, known := g.nodes[p.end]
+		// check if known, if not known - create
+		if !known {
+			node = Node{
+				c: p.end,
+				index: len(g.nodes),
+			}
+			node.name = node.Name()
+			g.nodes[p.end] = node
+			log.Printf("creating node %s %+v\n", node.Name(), node)
+		}
+		from := g.nodes[goingFrom]
+		log.Printf("from %s to %s\n", from.Name(), node.Name())
+		// and add vertices to currently traversed
+		if g.edges[node.index][from.index] == 0 {
+			g.edges[node.index][from.index] = goingLen
+			g.edges[from.index][node.index] = goingLen
+		} else {
+			knownEdge := g.edges[node.index][from.index]
+			if goingLen > knownEdge {
+				g.edges[node.index][from.index] = goingLen
+				g.edges[from.index][node.index] = goingLen
+			}
+		}
+		// NOTE ah, it's possible to have two edges between i and j
+		// but, i only need the longest one
+		// log.Printf("adding edges between %d & %d of len %d\n", node.index, from.index, goingLen)
+
+		// continue with new 'from' and len of 1
+		if !known {
+			for _, nextStep := range continuedPaths {
+				log.Printf("from %s should recurse to %+v", node.Name(), nextStep)
+				recursiveGraphStep(f, nextStep, g, p.end, 1, visitedPathPoints)
+			}
+		}
+	}
+
+	return
+}
+
+func GraphToMermaid(g Graph) (result string) {
+	result += "\nflowchart LR\n"
+	lines := mapset.NewSet[string]()
+	for _, node := range g.nodes {
+		for to, len := range g.edges[node.index] {
+			var toNode Node
+			for _, other := range g.nodes {
+				if other.index == to {
+					toNode = other
+				}
+			}
+			if len > 0 {
+				var fromName, toName string
+				if node.index < toNode.index {
+					fromName = node.Name()
+					toName = toNode.Name()
+				} else {
+					fromName = toNode.Name()
+					toName = node.Name()
+				}
+				line := fmt.Sprintf("\t%s---|length %d|%s\n", fromName, len, toName)
+				lines.Add(line)
+			}
+		}
+		// result += fmt.Sprintf("%s--|%d|%s\n", a ...any)
+	}
+
+	for line := range lines.Iter() {
+		result += line
+	}
+
+	return
+}
+
--- a/day23/graph_test.go
+++ b/day23/graph_test.go
@@ -0,0 +1,101 @@
+package day23
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	mapset "github.com/deckarep/golang-set/v2"
+)
+
+func TestGraphCreate(t *testing.T) {
+	filename := "example2"
+	field := ReadField(filename)
+
+	fmt.Println(field.SparseString())
+
+	graph := CreateGraph(field)
+	t.Log(graph)
+}
+
+func TestPrintGraph(t *testing.T) {
+	filename := "example2"
+	field := ReadField(filename)
+
+	fmt.Println(field.SparseString())
+
+	graph := CreateGraph(field)
+	t.Log(PrintFieldWithGraph(graph, field))
+	t.Logf(">>>\n %+v\n", graph)
+
+}
+
+func TestPrintGraphInput(t *testing.T) {
+	filename := "input"
+	field := ReadField(filename)
+
+	fmt.Println(field.SparseString())
+
+	graph := CreateGraph(field)
+	t.Log(PrintFieldWithGraph(graph, field))
+	t.Logf(">>>\n %+v\n", graph)
+
+}
+
+func TestPrintMermaidGraphInput(t *testing.T) {
+	filename := "input"
+	field := ReadField(filename)
+
+	fmt.Println(field.SparseString())
+
+	graph := CreateGraph(field)
+	mmdContent := GraphToMermaid(graph)
+	t.Log(mmdContent)
+
+	fileBorder, err := os.Create(filename + ".mmd")
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		if err := fileBorder.Close(); err != nil {
+			panic(err)
+		}
+	}()
+
+	fileBorder.WriteString(mmdContent)
+}
+
+func TestGraphMaxBetweenExample(t *testing.T) {
+	filename := "example"
+	field := ReadField(filename)
+	graph := CreateGraph(field)
+
+	t.Log(PrintFieldWithGraph(graph, field))
+
+
+	from := graph.nodes[Coord{Row: 0, Col: field.StartCol}]
+	to := graph.nodes[field.EndCoord()]
+
+	dist := graph.DFSLenOnGraph(from, mapset.NewSet[int](), to, 0)
+
+	t.Log(graph)
+	t.Logf("please dist %d", dist)
+
+}
+
+func TestGraphMaxBetweenInput(t *testing.T) {
+	filename := "input"
+	field := ReadField(filename)
+
+	graph := CreateGraph(field)
+
+	t.Log(PrintFieldWithGraph(graph, field))
+	from := graph.nodes[Coord{Row: 0, Col: field.StartCol}]
+	to := graph.nodes[field.EndCoord()]
+
+	dist := graph.DFSLenOnGraph(from, mapset.NewSet[int](), to, 0)
+
+	t.Log(graph)
+	t.Logf("please dist %d", dist)
+
+}
--- a/day23/input.mmd
+++ b/day23/input.mmd
@@ -0,0 +1,62 @@
+
+flowchart LR
+	M---|length 166|N
+	d---|length 62|h
+	H---|length 190|I
+	f---|length 136|h
+	j---|length 94|k
+	B---|length 152|L
+	I---|length 40|J
+	W---|length 56|X
+	E---|length 214|F
+	C---|length 60|K
+	V---|length 142|b
+	a---|length 110|b
+	I---|length 138|P
+	J---|length 184|K
+	Y---|length 146|a
+	c---|length 190|d
+	Q---|length 114|T
+	J---|length 240|O
+	C---|length 184|D
+	L---|length 172|M
+	Q---|length 140|R
+	Y---|length 464|k
+	O---|length 76|V
+	N---|length 102|O
+	K---|length 152|L
+	U---|length 80|c
+	V---|length 72|W
+	b---|length 202|j
+	A---|length 39|B
+	W---|length 236|a
+	P---|length 166|Q
+	e---|length 174|f
+	G---|length 186|R
+	T---|length 258|d
+	X---|length 142|Y
+	b---|length 128|c
+	F---|length 378|G
+	S---|length 108|T
+	N---|length 62|W
+	U---|length 110|V
+	a---|length 138|k
+	S---|length 234|e
+	d---|length 108|e
+	H---|length 166|Q
+	O---|length 158|P
+	M---|length 360|X
+	h---|length 184|i
+	B---|length 244|C
+	D---|length 96|J
+	D---|length 154|E
+	R---|length 118|S
+	E---|length 146|I
+	P---|length 128|U
+	T---|length 268|U
+	i---|length 198|j
+	G---|length 144|H
+	F---|length 102|H
+	f---|length 77|g
+	K---|length 266|N
+	c---|length 64|i
--- a/day23/notes.org
+++ b/day23/notes.org
@@ -0,0 +1,125 @@
+#+title: Notes
+* ok, second part is long.
+and here optimization of storing direction of enter into path, and it's length,
+would that be helpful?
+it might not, because based on visited some future longer path might not be available.
+
+i don't know how to optimize.
+
+i could maybe do same calculation in parallel, somehow
+put not into queue, but into channel
+* wait a second. previous answer was 2018
+and now long checks result in me waiting for intermediate 1882.
+let's add early cutoffs, if not end by 2018, then abandon
+doubt that's implementable
+
+* well. do i want to try parallel?
+seems like false path, really
+like there should be a better optimizaiton first
+* maybe we could join detours into 'potential longest paths'
+like if we traverse, and get to a point which was previously visited,
+for evey path that went through that split path,
+i could check whether i can take paths that went through this point, and switch their part with the detoured part.
+* and maybe we could continue longest paths first?
+like making pathsToFurther a heap by visited.Cordinality ?
+
+oh, and then we'll find 'some path to end'
+and additional paths will try to add their detour.
+
+so, i guess when finding a path to end, i could save path to end for each point.
+then if i reach the point, i could check if i can use some of the
+
+and i guess if i do depth first then i'll always have all paths to end from a point if i return to it?
+* this sounds like an idea.
+with heap do depth first.
+
+if it's first visit to a point, just go further
+if i find the end, i'd want to mark all points on the path with path info
+
+hm. recursive calls might make this easier.
+because i'd want both 'prefixVisited' set and totalPathSet
+
+due to depth first, we'll discover shortest path first.
+and points will get mapped with this first (of potential multiple) path info to end.
+
+now if on followup steps i get into the point with info on paths to end,
+that should mean that i've already found all paths to end from that point, right?
+
+now i need to check for the 'detour' which 'paths to end' are still possible with that detour added
+by taking set of elements from this point, to end. and checking that intersection with detour elements is 0.
+
+if there are like this - report finding a new path, and save to all elements of that path somehow.
+
+and now on finding detours i wouldn't need to re-check path to end, that should save a lot of time
+** so how to go about in coding this?
+have shared map[Coord][]EndPathInfo
+
+the DFS means i'm recursing into each child.
+and taking the result of the call.
+it should be info on path to end? or multiple paths to end.
+which should be added to current node.
+
+and then calling with start point will return paths to end from start, and i'll be able to take the by length
+
+ok. but. if i'm entering the coord, and there are already paths to end.
+then i need to presume that those are only possible paths to end from this point,
+because all other paths should have been explored by now,
+i for my 'detour' determine whether it is consistent with any of already found paths to end.
+** NO. dfs doesn't mean i'll find shortest path first.
+so if i'm in visited, it doesn't mean that stored is shorter and current is a detour.
+
+but dfs should mean that all paths from this prefix have finished.
+so, sure. there have to be all done?
+** my example2 has fork on row 3 col 10
+so 4,10 and 3,11 should be visited separately.
+
+6,17 is where they join and the point which should have second entry
+** allright, ugh. my new solution is memory hogging.
+maybe i can draw the stuff and it will be several neat thingies
+* maybe new approach?
+make a graph. with vertices of Start, End and Crossroads.
+yes.
+let's create a graph representation.
+** so, from A to AG
+i think i can do this manually now
+** distances are
+39
+244
+184
+154
+214
+378
+144
+190
+40
+184
+152
+172
+166
+102
+158
+166
+140
+118
+108
+268
+110
+72
+56
+142
+146
+110
+128
+190
+108
+174
+77
+1
+** again?
+no, let's write code.
+** didn't count all the way
+2023/12/23 15:55:55 at {index:30 c:{Row:125 Col:137} name:f} to {index:31 c:{Row:140 Col:139} name:g} cur dist is 3997.		|max so far 6406|
+signal: interrupt
+FAIL	sunshine.industries/aoc2023/day23	380.499s
+
+tried more or less stable value, and interrupted
--- a/day23/paths.go
+++ b/day23/paths.go
@@ -0,0 +1,161 @@
+package day23
+
+import (
+	"fmt"
+	"log"
+
+	mapset "github.com/deckarep/golang-set/v2"
+)
+
+type PathEnd struct {
+	end     Coord
+	visited mapset.Set[Coord]
+}
+func (p PathEnd)Sring() string {
+	return fmt.Sprintf("PathEnd[at %+v, visited: %+v]", p.end, p.visited)
+}
+
+func ExtendPath(p PathEnd, f Field) (nextPaths []PathEnd) {
+	endPointNeighbors := f.NeighborsPart2(p.end)
+	for _, potentialNewEnd := range endPointNeighbors {
+		if !p.visited.Contains(potentialNewEnd) {
+			nextVisited := p.visited.Clone()
+			nextVisited.Add(p.end)
+			nextPaths = append(nextPaths, PathEnd{
+				end:     potentialNewEnd,
+				visited: nextVisited,
+			})
+		}
+	}
+
+	return
+}
+
+// info on path from start to end
+type PathInfo struct {
+	Visited mapset.Set[Coord]
+}
+
+func RunDFSTingy(f Field) []PathInfo {
+	initialPath := PathEnd{
+		end: Coord{Row: 0, Col: f.StartCol}, visited: mapset.NewSet[Coord](),
+	}
+	initialShared := make(map[Coord][]PathInfo)
+	
+	return DFSScenicPaths(f, initialPath, initialShared)
+}
+
+var knownMax int = 0
+func CheckAndPrintMax(maybeNewMax int) {
+	if maybeNewMax > knownMax {
+		log.Printf("\n\n>>>>found new max: %d\n", maybeNewMax)
+		knownMax = maybeNewMax
+	}
+}
+
+func DFSScenicPaths(f Field, curPath PathEnd,
+	sharedMem map[Coord][]PathInfo) (pathsFromTheStartToEnd []PathInfo) {
+	curCoord := curPath.end
+
+	if curCoord == (Coord{ Row: 6, Col: 15 }) {
+		log.Println(">>>>>>>>")
+	}
+	// log.Printf("entering %+v with mem %+v\n", curPath, sharedMem[curCoord])
+
+	if curCoord == f.EndCoord() {
+		pathsFromTheStartToEnd = append(pathsFromTheStartToEnd, PathInfo{curPath.visited.Clone()})
+		log.Printf("got to end. cur len is %d\n", curPath.visited.Cardinality())
+		CheckAndPrintMax(curPath.visited.Cardinality())
+		// i guess return only from current to end?
+		// and on non terminal first time, return copy with self added?
+		return
+	}
+
+	// now for non final point
+	knownPaths, visitedBefore := sharedMem[curCoord]
+
+	// NOTE but this only if we haven't visited this coord before!
+	
+	if !visitedBefore {
+		nextSteps := ExtendPath(curPath, f)
+		suffixesFromCurToEnd := make([]PathInfo, 0)
+		for _, nextPath := range nextSteps {
+			pathsToEndThrough := DFSScenicPaths(f, nextPath, sharedMem)
+			// i guess here deduct the prefix.
+
+			for _, path := range pathsToEndThrough {
+				// will contain this and further
+				suffix := PathInfo{
+					Visited: path.Visited.Difference(curPath.visited).Clone(),
+				}
+				// log.Printf(">> from path \n%+v make suffix \n%+v\n\n", path, suffix)
+				suffixesFromCurToEnd = append(suffixesFromCurToEnd, suffix)
+			}
+
+			pathsFromTheStartToEnd = append(pathsFromTheStartToEnd, pathsToEndThrough...)
+
+			if len(pathsToEndThrough) != 0 {
+				// log.Printf("setting mem for %+v to %+v", curCoord, suffixesFromCurToEnd)
+				sharedMem[curCoord] = suffixesFromCurToEnd
+			}
+		}
+
+		return
+	} else {
+		// have visited this point before, due to dfs all possible paths to end should already be known
+		// so curPath.visited should contian a detour.
+		// need to figure out if this detour is compatible with any of the known paths to end
+		// from those create 'new' paths to end with that detour
+		// return those and add those to the shared mem
+		for _, knownPathToEnd := range knownPaths {
+			// those are all points through which this known path goes from current to end
+			// if our curPath
+			fromCurToEnd := knownPathToEnd.Visited
+			thisPrefix := curPath.visited
+
+			if thisPrefix.Intersect(fromCurToEnd).Cardinality() == 0 {
+				// then current prefix is compatible with this path.
+				fromCurPrefixToEnd := thisPrefix.Clone()
+				fromCurPrefixToEnd.Union(fromCurToEnd)
+				pathsFromTheStartToEnd = append(pathsFromTheStartToEnd, PathInfo{fromCurPrefixToEnd})
+				log.Printf("additional path to end of len %d\n", fromCurPrefixToEnd.Cardinality())
+				CheckAndPrintMax(fromCurPrefixToEnd.Cardinality())
+			}
+		}
+		log.Printf("having second visit into %+v.\n", curPath)
+		
+		return
+	}
+
+	panic("should not be reachable")
+}
+
+// return paths that end on End
+func RunAllScenicPaths(f Field) (result []PathEnd) {
+	pathsToFurther := []PathEnd{
+		{end: Coord{Row: 0, Col: f.StartCol}, visited: mapset.NewSet[Coord]()},
+	}
+
+	for len(pathsToFurther) > 0 {
+		curCheckedPath := pathsToFurther[0]
+		pathsToFurther = pathsToFurther[1:]
+
+		if curCheckedPath.end == f.EndCoord() {
+			result = append(result, curCheckedPath)
+			// log.Printf("found end path of len %d . %+v", curCheckedPath.visited.Cardinality(), curCheckedPath)
+			continue
+		}
+
+		nextSteps := ExtendPath(curCheckedPath, f)
+
+		// log.Printf("for %+v next steps %+v\n", curCheckedPath, pathsToFurther)
+		// log.Printf("remaining paths to check len is %d", len(pathsToFurther))
+		// log.Println(pathsToFurther)
+
+		if len(nextSteps) > 0 {
+			pathsToFurther = append(pathsToFurther, nextSteps...)
+		}
+	}
+
+	return
+}
--- a/day23/paths_test.go
+++ b/day23/paths_test.go
@@ -0,0 +1,19 @@
+package day23
+
+import "testing"
+
+func TestRunAllPaths(t *testing.T) {
+	filename := "example"
+	field := ReadField(filename)
+	finalPaths := RunAllScenicPaths(field)
+	t.Log(finalPaths)
+
+	max := 0
+	for _, path := range finalPaths {
+		if path.visited.Cardinality() > max {
+			max = path.visited.Cardinality()
+		}
+	}
+	t.Logf("max path len is %d", max)
+
+}
--- a/day23/willHelp.mmd
+++ b/day23/willHelp.mmd
@@ -0,0 +1,72 @@
+flowchart LR
+    L---|length 152|K
+    L---|length 172|M
+    U---|length 268|T
+    U---|length 110|V
+    W---|length 72|V
+    W---|length 56|X
+    a---|length 146|Y
+    a---|length 110|b
+    f---|length 174|e
+    f---|length 77|g
+    f---|length 136|h
+    H---|length 144|G
+    H---|length 190|I
+    T---|length 108|S
+    T---|length 268|U
+    M---|length 172|L
+    M---|length 166|N
+    F---|length 214|E
+    F---|length 378|G
+    I---|length 190|H
+    I---|length 40|J
+    A---|length 2|A
+    A---|length 39|B
+    Q---|length 166|P
+    Q---|length 140|R
+    Y---|length 142|X
+    Y---|length 146|a
+    d---|length 190|c
+    d---|length 108|e
+    e---|length 108|d
+    e---|length 174|f
+    h---|length 136|f
+    h---|length 184|i
+    J---|length 40|I
+    J---|length 184|K
+    N---|length 166|M
+    N---|length 102|O
+    X---|length 56|W
+    X---|length 142|Y
+    j---|length 198|i
+    j---|length 94|k
+    B---|length 39|A
+    B---|length 244|C
+    G---|length 378|F
+    G---|length 144|H
+    P---|length 158|O
+    P---|length 166|Q
+    D---|length 184|C
+    D---|length 154|E
+    E---|length 154|D
+    E---|length 214|F
+    K---|length 184|J
+    K---|length 152|L
+    O---|length 102|N
+    O---|length 158|P
+    R---|length 140|Q
+    R---|length 118|S
+    S---|length 118|R
+    S---|length 108|T
+    V---|length 110|U
+    V---|length 72|W
+    c---|length 128|b
+    c---|length 190|d
+    C---|length 244|B
+    C---|length 184|D
+    k---|length 94|j
+    i---|length 184|h
+    i---|length 198|j
+    g---|length 77|f
+    b---|length 110|a
+    b---|length 128|c
--- a/day23/willHelp.png
+++ b/day23/willHelp.png
--- a/day24/example
+++ b/day24/example
@@ -0,0 +1,5 @@
+19, 13, 30 @ -2,  1, -2
+18, 19, 22 @ -1, -1, -2
+20, 25, 34 @ -2, -2, -4
+12, 31, 28 @ -1, -2, -1
+20, 19, 15 @  1, -5, -3
--- a/day24/hailMary.go
+++ b/day24/hailMary.go
@@ -0,0 +1,73 @@
+package day24
+
+import (
+	"fmt"
+)
+
+// most inner loop
+// assumint stone hits h1 at t1, and h2 at t2
+// return the line. so 'HailParam' for my stone trajectory
+func AssumeHails(h1, h2 HailParam, t1, t2 int) (stoneTrajectory HailParam, isInt bool) {
+	Dx, isXInt := AssumedDelta(h1.p0.x, h2.p0.x, h1.Dx, h2.Dx, t1, t2)
+	Dy, isYInt := AssumedDelta(h1.p0.y, h2.p0.y, h1.Dy, h2.Dy, t1, t2)
+	Dz, isZInt := AssumedDelta(h1.p0.z, h2.p0.z, h1.Dz, h2.Dz, t1, t2)
+
+	isInt = isXInt && isYInt && isZInt
+
+	x := AssumedStartFromDelta(h1.p0.x, h1.Dx, t1, Dx)
+	y := AssumedStartFromDelta(h1.p0.y, h1.Dy, t1, Dy)
+	z := AssumedStartFromDelta(h1.p0.z, h1.Dz, t1, Dz)
+
+	stoneTrajectoryLine := fmt.Sprintf("%d, %d, %d @ %d, %d, %d", x, y, z, Dx, Dy, Dz)
+	stoneTrajectory = ReadHailLine(stoneTrajectoryLine)
+
+	return
+}
+
+func HailMaryLoop(hails []HailParam) {
+	// for t1, t2 from [1, 100]
+	// try to fit stoneTrajectory on every pair of hails.
+	// and hope for integer fit
+	for t1 := 1; t1 <= 100; t1++ {
+		for t2 := t1+1 ; t2 <= 100; t2++ {
+			for i, hail := range hails {
+			innerHail:
+				for j, otherHail := range hails {
+					if i == j {
+						continue innerHail
+					}
+					_, isInt := AssumeHails(hail, otherHail, t1, t2)
+					if !isInt {
+						continue innerHail // TODO first hope to loose
+					}
+					// if isInt {
+					// 	log.Printf("hail mary int fit between %s (%d) and %s (%d)",
+					// 		hail.SomeString(), t1,  otherHail.SomeString(), t2)
+					// }
+				}
+			}
+		}
+	}
+}
+
+// TODO check for inner loop : when get assumed stoneTrajectory
+// for all hail params, check that they intercept
+// func CheckAssumedTrajectory(assumedStone HailParam, hails []HailParam) bool {
+// 	for _, hail := range hails {
+// 		// i guess i could try to do what?
+// 		// assume oh, no. there can be t whatever
+// 	}
+// }
+
+func AssumedDelta(c1, c2 int, Dc1, Dc2 int, t1, t2 int) (delta int, isInt bool) {
+	divisor := t1 - t2
+	divisible := c1 - c2 + (t1 * Dc1) - (t2 * Dc2)
+
+	isInt = divisible % divisor == 0
+	delta = divisible / divisor
+	return
+}
+
+func AssumedStartFromDelta(c1 int, Dc1 int, t1, Dc int) (c int) {
+	return c1 + t1 * Dc1 - t1 * Dc
+}
--- a/day24/hailMary_test.go
+++ b/day24/hailMary_test.go
@@ -0,0 +1,9 @@
+package day24
+
+import "testing"
+
+func TestHailMaryOnExamle(t *testing.T) {
+	filename := "input"
+	hails := ReadHailFile(filename)
+	HailMaryLoop(hails)
+}
--- a/day24/lines.go
+++ b/day24/lines.go
@@ -0,0 +1,196 @@
+package day24
+
+import (
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const (
+	// CoordMin int = 7
+	// CoordMax int = 27
+	CoordMin int = 200000000000000
+	CoordMax int = 400000000000000
+)
+
+type Point struct {
+	x, y, z int
+}
+
+type HailParam struct {
+	p0, p1     Point
+	Dx, Dy, Dz int
+	line       string
+	// for 2d : ay + bx = 0
+	a, b, c int
+	// for 2d : y = slope*x + shift
+	slope, shift float64
+}
+
+func (h *HailParam) SomeString() string {
+	return h.line
+}
+
+func (h *HailParam) GetCoord(name string) (result int) {
+	switch name {
+	case "x":
+		result = h.p0.x
+	case "y":
+		result = h.p0.y
+	case "z":
+		result = h.p0.z
+	default:
+		panic("unknown param")
+	}
+
+	return
+}
+
+func (h *HailParam) GetSpeedOf(name string) (result int) {
+	switch name {
+	case "x":
+		result = h.Dx
+	case "y":
+		result = h.Dy
+	case "z":
+		result = h.Dz
+	default:
+		panic("unknown param")
+	}
+
+	return
+}
+
+func CheckPairwiseIntersections(hails []HailParam) (totalIntersections int) {
+	for i, hail := range hails {
+		for j := i + 1; j < len(hails); j++ {
+			otherHail := hails[j]
+			intersect := CheckTaskIntersection(hail, otherHail)
+			if intersect {
+				totalIntersections += 1
+			}
+		}
+	}
+	return
+}
+
+func CheckTaskIntersection(h1, h2 HailParam) (doIntersect bool) {
+	log.Printf("intersecting %+v and %+v\n", h1, h2)
+	// x, y, intersectAtAll := IntersectByTwoPoints(h1, h2)
+	x, y, intersectAtAll := IntersectBySlopeAndShift(h1, h2)
+	if !intersectAtAll {
+		log.Println("no intersection at all\n", x, y)
+		return false
+	}
+	isH1Future := h1.FloatPointInFuture(x, y)
+	isH2Future := h2.FloatPointInFuture(x, y)
+
+	if !isH1Future {
+		log.Printf("point %f, %f in the past for h1\n", x, y)
+	}
+	if !isH2Future {
+		log.Printf("point %f, %f in the past for h2\n", x, y)
+	}
+	if !isH1Future || !isH2Future {
+		return false
+	}
+
+	if x < float64(CoordMin) || x > float64(CoordMax) ||
+		y < float64(CoordMin) || y > float64(CoordMax) {
+		log.Printf("intersect at %f %f but outside of area\n", x, y)
+		return false // outside of area
+	}
+
+	log.Println("> intersect inside of the area! ", x, y)
+	return true
+}
+
+func IntersectInTheeDimentions(h1, h2 HailParam) (interX, interY, interZ float64,
+	interT float64, isIntersecting bool) {
+
+	return
+}
+
+func IntersectBySlopeAndShift(h1, h2 HailParam) (intersectionX, intersectionY float64, isIntersecting bool) {
+	if h1.slope == h2.slope {
+		return
+	}
+	// y = slope * x + shift
+	// slope1 * x + shift1 = slope2 * x + shift2
+	// x = ( shift2 - shift1 ) / (slope1 - slope2)
+
+	x := (h2.shift - h1.shift) / (h1.slope - h2.slope)
+	y := h1.slope*x + h1.shift
+
+	return x, y, true
+}
+
+func (h HailParam) PointInFuture(p Point) bool {
+	xPositiveSteps := (p.x-h.p0.x)*h.Dx >= 0
+	yPositiveSteps := (p.y-h.p0.y)*h.Dy >= 0
+	zPositiveSteps := (p.z-h.p0.z)*h.Dz >= 0
+	return xPositiveSteps && yPositiveSteps && zPositiveSteps
+}
+func (h HailParam) FloatPointInFuture(x, y float64) bool {
+	xPositiveSteps := (x-float64(h.p0.x))*float64(h.Dx) >= 0
+	// yPositiveSteps := (y - float64(h.p0.y)) * float64(h.Dy) >= 0
+	// return xPositiveSteps && yPositiveSteps
+	return xPositiveSteps
+}
+
+// 19, 13, 30 @ -2,  1, -2
+func ReadHailLine(line string) (h HailParam) {
+	h.line = line
+	line = strings.ReplaceAll(line, "@", "")
+	line = strings.ReplaceAll(line, ",", "")
+	fields := strings.Fields(line)
+
+	h.p0.x = AtoIOrPanic(fields[0])
+	h.p0.y = AtoIOrPanic(fields[1])
+	h.p0.z = AtoIOrPanic(fields[2])
+	h.Dx = AtoIOrPanic(fields[3])
+	h.Dy = AtoIOrPanic(fields[4])
+	h.Dz = AtoIOrPanic(fields[5])
+
+	countP1AfterMillis := 1
+
+	h.p1.x = h.p0.x + countP1AfterMillis*h.Dx
+	h.p1.y = h.p0.y + countP1AfterMillis*h.Dy
+	h.p1.z = h.p0.z + countP1AfterMillis*h.Dz
+
+	h.a = h.p0.y - h.p1.y
+	h.b = h.p1.x - h.p0.x
+	h.c = -(h.p0.x*h.p1.y - h.p1.x*h.p0.y)
+
+	h.slope = float64(h.Dy) / float64(h.Dx)
+	// y = slope * x + shift
+	// shift = y - slope * x // for some point
+	h.shift = float64(h.p0.y) - h.slope*float64(h.p0.x)
+
+	return
+}
+
+func ReadHailFile(filename string) []HailParam {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+	text := strings.TrimSpace(string(bytes))
+	lines := strings.Split(text, "\n")
+	result := make([]HailParam, len(lines))
+
+	for i, line := range lines {
+		result[i] = ReadHailLine(line)
+	}
+
+	return result
+}
+
+func AtoIOrPanic(str string) (num int) {
+	num, err := strconv.Atoi(str)
+	if err != nil {
+		panic(err)
+	}
+	return
+}
--- a/day24/lines_test.go
+++ b/day24/lines_test.go
@@ -0,0 +1,87 @@
+package day24
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestReadLine(t *testing.T) {
+	lines := `19, 13, 30 @ -2,  1, -2
+18, 19, 22 @ -1, -1, -2
+20, 25, 34 @ -2, -2, -4
+12, 31, 28 @ -1, -2, -1
+20, 19, 15 @  1, -5, -3`
+
+	for _, line := range strings.Split(lines, "\n") {
+		hail := ReadHailLine(line)
+		t.Log(hail)
+	}
+
+}
+
+func TestReadLineInput(t *testing.T) {
+	lines := `147847636573416, 190826994408605, 140130741291716 @ 185, 49, 219
+287509258905812, 207449079739538, 280539021150559 @ -26, 31, 8
+390970075767404, 535711685410735, 404166182422876 @ -147, -453, -149
+306391780523937, 382508967958270, 264612201472049 @ -24, -274, 28
+278063616684570, 510959526404728, 288141792965603 @ -18, -441, -6`
+	for _, line := range strings.Split(lines, "\n") {
+		hail := ReadHailLine(line)
+		t.Logf("%+v\n", hail)
+	}
+
+}
+
+func TestSecondPointIsInFuture(t *testing.T) {
+	lines := `19, 13, 30 @ -2,  1, -2
+18, 19, 22 @ -1, -1, -2
+20, 25, 34 @ -2, -2, -4
+12, 31, 28 @ -1, -2, -1
+20, 19, 15 @  1, -5, -3`
+
+	for _, line := range strings.Split(lines, "\n") {
+		hail := ReadHailLine(line)
+		t.Log(hail)
+		t.Logf("calced seconds point %+v is in future %t\n", hail.p1, hail.PointInFuture(hail.p1))
+	}
+
+}
+
+func TestIntersectExampleOne(t *testing.T) {
+	// Hailstone A: 19, 13, 30 @ -2, 1, -2
+	// Hailstone B: 18, 19, 22 @ -1, -1, -2
+	// Hailstones' paths will cross inside the test area (at x=14.333, y=15.333).
+
+	hA := ReadHailLine("19, 13, 30 @ -2, 1, -2")
+	hB := ReadHailLine("18, 19, 22 @ -1, -1, -2")
+
+	x, y, check := IntersectBySlopeAndShift(hA, hB)
+	if !check {
+		panic("should intersect")
+	}
+	t.Logf("got intersection at %f %f", x, y)
+}
+
+func TestIntersectExampleTwo(t *testing.T) {
+	// Hailstone A: 18, 19, 22 @ -1, -1, -2
+	// Hailstone B: 20, 25, 34 @ -2, -2, -4
+	hA := ReadHailLine("18, 19, 22 @ -1, -1, -2")
+	hB := ReadHailLine("20, 25, 34 @ -2, -2, -4")
+
+	x, y, check := IntersectBySlopeAndShift(hA, hB)
+	if check {
+		panic("should not intersect")
+	}
+	t.Logf("got intersection at %f %f", x, y)
+}
+
+func TestExamplePairwiseChecks(t *testing.T) {
+	filename := "example"
+	hails := ReadHailFile(filename)
+	for _, hail := range hails {
+		t.Log(hail)
+	}
+
+	intersections := CheckPairwiseIntersections(hails)
+	t.Log("counted intersections ", intersections)
+}
--- a/day24/neverTellMeTheOdds.go
+++ b/day24/neverTellMeTheOdds.go
@@ -0,0 +1,12 @@
+package day24
+
+import (
+	"fmt"
+)
+
+func Run() int {
+	fmt.Println("hello day 24, i'm getting tired")
+	filenae := "day24/input"
+	hails := ReadHailFile(filenae)
+	return CheckPairwiseIntersections(hails)
+}
--- a/day24/notes.org
+++ b/day24/notes.org
@@ -0,0 +1,118 @@
+#+title: Notes
+* i want help from math
+https://math.stackexchange.com/questions/28503/how-to-find-intersection-of-two-lines-in-3d
+
+'vector parametric form' is exactly what we're getting in the input?
+* huh and only 'looking forward in time' so solutions with negative t are not important.
+cooool
+** i see that speeds are integers, so updated points are integers.
+maybe i do calculation of every line on every time point?
+
+and if i do that is there a way to get intersections efficietly?
+** i'll also need the ends for lines? ends to the line segments.
+with limits on the x & y by the task
+
+for example both 7 <= <= 27
+for input 200000000000000 <= <= 400000000000000
+
+also. can't we move the coords? maybe not? maybe only for one
+so, what do i do? to get the ends of the lines?
+i try to calcluate with both x & y in 2 min\max. then if the other is ok, than that's the ends?
+wait, what happens when i do x = 7, and x = 27 and y is outside? it means no intesections, i guess
+or it could be outside from different sides, so not all x are ok, but there's still line there
+** Using homogeneous coordinates
+https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection
+no, i don't understant that
+** https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection#Given_two_points_on_each_line
+with 2 points. i guess
+but also - check if the point in future of the hail, by comparing with speeds?
+should be easy
+** and i got wrong result
+day24 result: 8406
+** another formula gives
+day24 result: 8406
+** another formula
+12938
+*
+* ok, part 2.
+what if.
+i start checking t = 0, 1, etc.
+for each t, i need two points of the two hail lines.
+
+it would constitute the trajectory.
+then condition for the solution that all other hail lines will intersect it at some t.
+so check for intersection (maybe not necessarily in the field?)
+
+go though lines, if any fail to intersect - continue with t
+
+if all intersect, find where the rock has to be in time 0
+
+oh. no.
+it's not just intersect. it's that the movement of the rock with t would be there at correct time? yuck?
+
+would there really be more than i line that intersects all of the hail lines?
+
+i'll just need to also figure out t=0 from other coords.
+
+i don't like this at all.
+
+And intersections have to be over (X, Y, Z)
+** so 'hail mary' approach would be
+scan first 1k nanoseconds. so already 1M calculations
+( this is first part of desperation, that at least 2 hails will intercept in first 1k ticks )
+
+for collision 1, assume HailA is on path.
+then iterate for all other assumint they are intercepted on t 2 etc ?
+
+no. the intersections could be on non-integer times?
+( this would be second part of the 'hail mary' )
+
+from that i should be able to construct the 'trajectory' line.
+and then check with all other points - do the intersect?
+( and check of intersection in future would be nice )
+
+then if line confirmed, will need to calc for t = 0, t = 1, and get speeds
+*** not hoping for all integer intersections
+or what if i will hope for that?
+let's try?
+* ok, what if i could do system of equasions?
+    #+begin_src
+    yuck_test.go:12:
+        x + Dx * t0 == 19 + -2 * t0
+        y + Dy * t0 == 13 + 1 * t0
+        z + Dz * t0 == 19 + -2 * t0
+        x + Dx * t1 == 18 + -1 * t1
+        y + Dy * t1 == 19 + -1 * t1
+        z + Dz * t1 == 18 + -2 * t1
+        x + Dx * t2 == 20 + -2 * t2
+        y + Dy * t2 == 25 + -2 * t2
+        z + Dz * t2 == 20 + -4 * t2
+        solve for x, y, z, Dx, Dy, Dz, t1, t2, t3. ti > 0
+    #+end_src
+
+    #+begin_src
+    yuck_test.go:18:
+        x + Dx * t0 == 147847636573416 + 185 * t0
+        y + Dy * t0 == 190826994408605 + 49 * t0
+        z + Dz * t0 == 147847636573416 + 219 * t0
+        x + Dx * t1 == 287509258905812 + -26 * t1
+        y + Dy * t1 == 207449079739538 + 31 * t1
+        z + Dz * t1 == 287509258905812 + 8 * t1
+        x + Dx * t2 == 390970075767404 + -147 * t2
+        y + Dy * t2 == 535711685410735 + -453 * t2
+        z + Dz * t2 == 390970075767404 + -149 * t2
+        solve for x, y, z, Dx, Dy, Dz, t1, t2, t3. ti > 0
+    #+end_src
+* got some solution
+https://z3prover.github.io/papers/programmingz3.html#sec-intro
+
+enefedov@LLF33A87M:~/Documents/personal/advent-of-code-2023$ python day24/pythonZ3/forInput.py
+Solution: [t0 = 666003776903,
+ t2 = 779453185471,
+ t1 = 654152070134,
+ Dz = 18,
+ Dx = 47,
+ Dy = -360,
+ z = 273997500449219,
+ y = 463222539161932,
+ x = 239756157786030]
--- a/day24/pythonZ3/example.py
+++ b/day24/pythonZ3/example.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+from z3 import *
+
+s = Solver()
+
+x = Real('x')
+Dx = Real('Dx')
+y = Real('y')
+Dy = Real('Dy')
+z = Real('z')
+Dz = Real('Dz')
+t0 = Real('t0')
+eqT0 = t0 >= 0
+eq0x = x + Dx * t0 == (-2 * t0) + 19
+eq0y = y + Dy * t0 == (1 * t0) + 13
+eq0z = z + Dz * t0 == (-2 * t0) + 30
+t1 = Real('t1')
+eqT1 = t1 >= 0
+eq1x = x + Dx * t1 == (-1 * t1) + 18
+eq1y = y + Dy * t1 == (-1 * t1) + 19
+eq1z = z + Dz * t1 == (-2 * t1) + 22
+t2 = Real('t2')
+eqT2 = t2 >= 0
+eq2x = x + Dx * t2 == (-2 * t2) + 20
+eq2y = y + Dy * t2 == (-2 * t2) + 25
+eq2z = z + Dz * t2 == (-4 * t2) + 34
+#solve for x, y, z, Dx, Dy, Dz, t1, t2, t3.
+
+
+s.add(eqT0,
+      eq0x,
+      eq0y,
+      eq0z,
+      eqT1,
+      eq1x,
+      eq1y,
+      eq1z,
+      eqT2,
+      eq2x,
+      eq2y,
+eq2z)
+
+if s.check() == sat:
+    print("Solution:", s.model())
+else:
+    print("No solution found")
--- a/day24/pythonZ3/forInput.py
+++ b/day24/pythonZ3/forInput.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+from z3 import *
+
+s = Solver()
+
+x = Real('x')
+Dx = Real('Dx')
+y = Real('y')
+Dy = Real('Dy')
+z = Real('z')
+Dz = Real('Dz')
+t0 = Real('t0')
+eqT0 = t0 >= 0
+eq0x = x + Dx * t0 == (185 * t0) + 147847636573416
+eq0y = y + Dy * t0 == (49 * t0) + 190826994408605
+eq0z = z + Dz * t0 == (219 * t0) + 140130741291716
+t1 = Real('t1')
+eqT1 = t1 >= 0
+eq1x = x + Dx * t1 == (-26 * t1) + 287509258905812
+eq1y = y + Dy * t1 == (31 * t1) + 207449079739538
+eq1z = z + Dz * t1 == (8 * t1) + 280539021150559
+t2 = Real('t2')
+eqT2 = t2 >= 0
+eq2x = x + Dx * t2 == (-147 * t2) + 390970075767404
+eq2y = y + Dy * t2 == (-453 * t2) + 535711685410735
+eq2z = z + Dz * t2 == (-149 * t2) + 404166182422876
+#solve for x, y, z, Dx, Dy, Dz, t1, t2, t3.
+
+
+s.add(eqT0,
+      eq0x,
+      eq0y,
+      eq0z,
+      eqT1,
+      eq1x,
+      eq1y,
+      eq1z,
+      eqT2,
+      eq2x,
+      eq2y,
+eq2z)
+
+if s.check() == sat:
+    print("Solution:", s.model())
+else:
+    print("No solution found")
+
+print(273997500449219 + 463222539161932 + 239756157786030)
--- a/day24/pythonZ3/practice.py
+++ b/day24/pythonZ3/practice.py
@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+
+from z3 import *
+
+x = Real('x')
+y = Real('y')
+
+eq1 = x + y == 5
+eq2 = x - y == 3
+
+s = Solver()
+s.add(eq1, eq2)
+
+if s.check() == sat:
+    print("Solution:", s.model())
+else:
+    print("No solution found")
--- a/day24/yuck.go
+++ b/day24/yuck.go
@@ -0,0 +1,78 @@
+package day24
+
+import (
+	"fmt"
+)
+
+func SystemsWithSymbols() (result string) {
+	result += "\n"
+	coords := []string{"x", "y", "z"}
+	for i := 0; i < 3; i++ {
+		for _, coord := range coords {
+			result += fmt.Sprintf("%s + D%s * t%d == %s%d + D%s%d * t%d\n",
+				coord, coord, i, coord, i, coord, i, i)
+		}
+	}
+
+	result += "solve for x, y, z, Dx, Dy, Dz, t1, t2, t3. ti > 0"
+
+	return
+}
+
+func SystemFromThreeHailstones(hails []HailParam) (result string) {
+	result += "\n"
+	coords := []string{"x", "y", "z"}
+	for i := 0; i < 3; i++ {
+		result += fmt.Sprintf("t%d >= 0\n", i)
+		hailIter := hails[i]
+		for _, coord := range coords {
+			result += fmt.Sprintf("%s + D%s * t%d == %d + %d * t%d\n",
+				coord, coord, i,
+				hailIter.GetCoord(coord), hailIter.GetSpeedOf(coord), i)
+		}
+	}
+
+	result += "solve for x, y, z, Dx, Dy, Dz, t1, t2, t3."
+	return
+}
+
+func SystemFromThreeHailstonesToTheLeft(hails []HailParam) (result string) {
+	result += "\n"
+	coords := []string{"x", "y", "z"}
+	for i := 0; i < 3; i++ {
+		result += fmt.Sprintf("t%d >= 0\n", i)
+		hailIter := hails[i]
+		for _, coord := range coords {
+			result += fmt.Sprintf("%s + D%s * t%d - (%d * t%d) == %d \n",
+				coord, coord, i,
+				hailIter.GetSpeedOf(coord), i, hailIter.GetCoord(coord))
+		}
+	}
+
+	result += "solve for x, y, z, Dx, Dy, Dz, t1, t2, t3."
+	return
+}
+
+func SystemAsPythonInit(hails []HailParam) (result string) {
+	result += "\n"
+	coords := []string{"x", "y", "z"}
+	for _, coord := range coords {
+		result += fmt.Sprintf("%s = Real('%s')\n", coord, coord)
+		result += fmt.Sprintf("D%s = Real('D%s')\n", coord, coord)
+	}
+
+	for i := 0; i < 3; i++ {
+		result += fmt.Sprintf("t%d = Real('t%d')\n", i, i)
+		result += fmt.Sprintf("eqT%d = t%d >= 0\n", i, i)
+		hailIter := hails[i]
+		for _, coord := range coords {
+			result += fmt.Sprintf("eq%d%s = %s + D%s * t%d == (%d * t%d) + %d \n",
+				i, coord,
+				coord, coord, i,
+				hailIter.GetSpeedOf(coord), i, hailIter.GetCoord(coord))
+		}
+	}
+
+	result += "//solve for x, y, z, Dx, Dy, Dz, t1, t2, t3."
+	return
+}
--- a/day24/yuck_test.go
+++ b/day24/yuck_test.go
@@ -0,0 +1,19 @@
+package day24
+
+import "testing"
+
+func TestPrintJustSymbol(t *testing.T) {
+	t.Log(SystemsWithSymbols())
+}
+
+func TestPrintSystemExample(t *testing.T) {
+	filename := "example"
+	hails := ReadHailFile(filename)
+	t.Log(SystemAsPythonInit(hails))
+}
+
+func TestPrintSystemInput(t *testing.T) {
+	filename := "input"
+	hails := ReadHailFile(filename)
+	t.Log(SystemAsPythonInit(hails))
+}
--- a/day25/Snowerload.go
+++ b/day25/Snowerload.go
@@ -0,0 +1,10 @@
+package day25
+
+import (
+	"fmt"
+)
+
+func Run() int {
+	fmt.Println("time to wrap things up")
+	return 0
+}
--- a/day25/after-removing-cycles.mmd
+++ b/day25/after-removing-cycles.mmd
--- a/day25/example
+++ b/day25/example
@@ -0,0 +1,13 @@
+jqt: rhn xhk nvd
+rsh: frs pzl lsr
+xhk: hfx
+cmg: qnr nvd lhk bvb
+rhn: xhk bvb hfx
+bvb: xhk hfx
+pzl: lsr hfx nvd
+qnr: nvd
+ntq: jqt hfx bvb xhk
+nvd: lhk
+lsr: lhk
+rzs: qnr cmg lsr rsh
+frs: qnr lhk lsr
--- a/day25/example-after-removing.mmd
+++ b/day25/example-after-removing.mmd
@@ -0,0 +1,15 @@
+flowchart TD
+	cmg --- qnr
+	cmg --- lhk
+	jqt --- nvd
+	bvb --- rhn
+	lsr --- pzl
+	lhk --- lsr
+	lsr --- rsh
+	hfx --- ntq
+	qnr --- rzs
+	bvb --- hfx
+	lhk --- nvd
+	frs --- qnr
+	jqt --- ntq
+	rhn --- xhk
--- a/day25/example-before-removing.mmd
+++ b/day25/example-before-removing.mmd
@@ -0,0 +1,34 @@
+flowchart TD
+	ntq --- xhk
+	bvb --- hfx
+	lsr --- pzl
+	nvd --- pzl
+	pzl --- rsh
+	frs --- lhk
+	bvb --- cmg
+	jqt --- xhk
+	bvb --- rhn
+	jqt --- rhn
+	hfx --- xhk
+	frs --- lsr
+	lhk --- lsr
+	jqt --- nvd
+	cmg --- rzs
+	hfx --- pzl
+	bvb --- xhk
+	rhn --- xhk
+	frs --- rsh
+	cmg --- qnr
+	nvd --- qnr
+	qnr --- rzs
+	bvb --- ntq
+	frs --- qnr
+	cmg --- nvd
+	hfx --- rhn
+	jqt --- ntq
+	hfx --- ntq
+	lsr --- rsh
+	cmg --- lhk
+	rsh --- rzs
+	lhk --- nvd
+	lsr --- rzs
--- a/day25/example-graph.mmd
+++ b/day25/example-graph.mmd
@@ -0,0 +1,34 @@
+flowchart TD
+	hfx --- pzl
+	cmg --- lhk
+	lsr --- rsh
+	rsh --- rzs
+	bvb --- rhn
+	jqt --- xhk
+	nvd --- pzl
+	lsr --- pzl
+	frs --- qnr
+	frs --- lsr
+	lhk --- lsr
+	lsr --- rzs
+	rhn --- xhk
+	hfx --- ntq
+	nvd --- qnr
+	qnr --- rzs
+	bvb --- xhk
+	hfx --- xhk
+	jqt --- rhn
+	jqt --- nvd
+	cmg --- nvd
+	lhk --- nvd
+	frs --- rsh
+	ntq --- xhk
+	cmg --- rzs
+	bvb --- ntq
+	cmg --- qnr
+	hfx --- rhn
+	jqt --- ntq
+	bvb --- cmg
+	frs --- lhk
+	pzl --- rsh
+	bvb --- hfx
--- a/day25/example-graph.mmd.svg
+++ b/day25/example-graph.mmd.svg
--- a/day25/example2
+++ b/day25/example2
@@ -0,0 +1,3 @@
+jqt: rhn nvd rsh
+rsh: frs pzl lsr
+xhk: hfx
--- a/day25/graph.go
+++ b/day25/graph.go
@@ -0,0 +1,301 @@
+package day25
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	mapset "github.com/deckarep/golang-set/v2"
+)
+
+type Graph struct {
+	Nodes map[string]*Node
+}
+
+type Node struct {
+	Name      string
+	Neighbors mapset.Set[string]
+}
+
+func (n Node) String() string {
+	return fmt.Sprintf("[%s : %+v]", n.Name, n.Neighbors)
+}
+
+func ReadGraphFile(filename string) (g Graph) {
+	g.Nodes = map[string]*Node{}
+
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+	text := strings.TrimSpace(string(bytes))
+	for _, line := range strings.Split(text, "\n") {
+		g.readGraphLine(line)
+	}
+
+	return
+}
+
+func (g *Graph) readGraphLine(l string)  {
+	firstSplit := strings.Split(l, ":")
+
+	node, exists := g.Nodes[firstSplit[0]]
+	if !exists {
+		node = &Node{
+			Name:      firstSplit[0],
+			Neighbors: mapset.NewSet[string](),
+		}
+	}
+
+	secondSplit := strings.Fields(firstSplit[1])
+
+	for _, neighborName := range secondSplit {
+		neighbor, exists := g.Nodes[neighborName]
+		if !exists {
+			neighbor = &Node{
+				Name:      neighborName,
+				Neighbors: mapset.NewSet[string](),
+			}
+			g.Nodes[neighborName] = neighbor
+		}
+		neighbor.Neighbors.Add(node.Name)
+		node.Neighbors.Add(neighbor.Name)
+	}
+
+	g.Nodes[node.Name] = node
+
+	return
+}
+
+// NOTE this is so sad. nodeA.Neighbors.Remove(nodeB.Name) hangs for a reason i don't understand
+func (g *Graph) RemoveEdge(a, b string) {
+	// log.Printf("entering remove edge for %s and %s", a, b)
+	nodeA, existsA := g.Nodes[a]
+	// log.Println("got first node", nodeA, existsA)
+	nodeB, existsB := g.Nodes[b]
+	// log.Println("got second node", nodeB, existsB)
+	if !existsA || !existsB {
+		panic("requesting not found node")
+	}
+
+	// log.Println("before removals")
+	// log.Println("before remove first", nodeA)
+	// nodeA.Neighbors = newANeighbors
+	nodeA.Neighbors = nodeA.Neighbors.Difference(mapset.NewSet[string](nodeB.Name))
+	// nodeA.Neighbors.Remove(nodeB.Name)
+	// log.Println("removed first", nodeA)
+
+	// log.Println("before remove second", nodeB)
+	// nodeB.Neighbors = newBNeighbors
+	nodeB.Neighbors = nodeB.Neighbors.Difference(mapset.NewSet[string](nodeA.Name))
+	// nodeB.Neighbors.Remove(nodeA.Name)
+	// log.Println("removed second", nodeB)
+}
+
+func (g *Graph) AddEdge(a, b string) {
+	nodeA, existsA := g.Nodes[a]
+	nodeB, existsB := g.Nodes[b]
+	if !existsA || !existsB {
+		panic("requesting not found node")
+	}
+	nodeA.Neighbors.Add(nodeB.Name)
+	nodeB.Neighbors.Add(nodeA.Name)
+}
+
+func (g *Graph) findCycle() (from, to string, exists bool) {
+	// log.Printf(">>>> starting new find cycle")
+	var firstNode *Node
+	for _, n := range g.Nodes {
+		firstNode = n
+		break
+	}
+	// log.Printf("initial search from %s and neighbors %+v", firstNode.Name, firstNode.Neighbors)
+	for neighborName := range firstNode.Neighbors.Iter() {
+		initialVisited := mapset.NewSet[string](firstNode.Name)
+		// log.Printf("initial dfs from %s to %s with initial visited %+v", firstNode.Name, neighborName, initialVisited)
+		from, to, exists = g.dfcCycle(firstNode.Name, neighborName, initialVisited)
+		if exists {
+			break
+		}
+	}
+
+	// log.Printf("<<<< cycle %t, from %s to %s", exists, from, to)
+	return
+}
+
+func (g *Graph) dfcCycle(fromName, atName string, visited mapset.Set[string]) (cycleFrom, cycleTo string, cycleExists bool) {
+	// log.Printf("> step from %+v to %+v. visited : %+v", fromName, atName, visited)
+	if visited.Cardinality() == len(g.Nodes) {
+		log.Println("exit by visited all")
+		return
+	}
+
+	atNode := g.Nodes[atName]
+
+	if visited.Contains(atName) {
+		return fromName, atName, true
+	}
+
+	for neighborName := range atNode.Neighbors.Iter() {
+		if neighborName == fromName {
+			continue
+		}
+		newVisited := visited.Clone()
+		newVisited.Add(atName)
+		cycleFrom, cycleTo, cycleExists = g.dfcCycle(atName, neighborName, newVisited)
+		if cycleExists {
+			break
+		}
+	}
+
+	return
+}
+
+func (g *Graph) ComponentFrom(fromName string) (component mapset.Set[string]) {
+	startNode := g.Nodes[fromName]
+	component = mapset.NewSet[string](startNode.Name)
+	toVisit := startNode.Neighbors.Clone()
+
+	for toVisit.Cardinality() > 0 {
+		runnerNodeName, _ := toVisit.Pop()
+		if component.Contains(runnerNodeName) {
+			continue
+		}
+		component.Add(runnerNodeName)
+		runnerNode := g.Nodes[runnerNodeName]
+		unvisitedNeighbors := runnerNode.Neighbors.Difference(component)
+		// log.Printf("adding %s to component. neighbors %+v, adding %+v to visit",
+		// 	runnerNodeName, runnerNode.Neighbors, unvisitedNeighbors)
+		toVisit = toVisit.Union(unvisitedNeighbors)
+	}
+
+	return
+}
+
+func (g *Graph) ToMermaid() (result string) {
+	result += "flowchart TD\n"
+	edges := mapset.NewSet[string]()
+
+	for _, node := range g.Nodes {
+		for neighborName := range node.Neighbors.Iter() {
+			var first, second string
+			if node.Name < neighborName {
+				first = node.Name
+				second = neighborName
+			} else {
+				first = neighborName
+				second = node.Name
+			}
+			edges.Add(fmt.Sprintf("\t%s --- %s\n", first, second))
+		}
+	}
+
+	for line := range edges.Iter() {
+		result += line
+	}
+	return
+}
+
+func (g *Graph)SaveAsMermaid(filename string) {
+	mmd := g.ToMermaid()
+
+	file, err := os.Create(filename)
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		if err := file.Close(); err != nil {
+			panic(err)
+		}
+	}()
+
+	file.WriteString(mmd)
+}
+
+type Edge struct {
+	smaller, bigger string
+}
+func (e Edge)String() string {
+	return fmt.Sprintf("%s/%s", e.smaller, e.bigger)
+}
+
+func CreateEdge(a, b string) Edge {
+	var smaller, bigger string
+	if a < b {
+		smaller = a
+		bigger = b
+	} else {
+		smaller = b
+		bigger = a
+	}
+	return Edge{smaller, bigger}
+}
+
+func (g *Graph) RemoveAllCycles() (removedEdges mapset.Set[Edge]) {
+	removedEdges = mapset.NewSet[Edge]()
+	hasCycle := true
+	var from, to string
+	for hasCycle {
+		from, to, hasCycle = g.findCycle()
+		if hasCycle {
+			// log.Printf("\n!!!! found cycle %s to %s\n", from, to)
+			edgeToRemove := CreateEdge(from, to)
+			removedEdges.Add(edgeToRemove)
+			g.RemoveEdge(from, to)
+		}
+	}
+	return
+}
+
+func (g *Graph) TryToSplit() (componentSizeMult int) {
+	// first remove all cycles
+	removedEdges := g.RemoveAllCycles()
+	g.SaveAsMermaid("after-removing-cycles.mmd")
+	// log.Printf("all removed edges %+v, two of them are necessary to split initial graph into 2 ", removedEdges)
+
+	triedEdges := mapset.NewSet[Edge]()
+
+	for _, node := range g.Nodes {
+		for neighborName := range node.Neighbors.Iter() {
+			edge := CreateEdge(neighborName, node.Name)
+			if triedEdges.Contains(edge) {
+				continue
+			}
+			triedEdges.Add(edge)
+			// first remove the edge
+			g.RemoveEdge(edge.bigger, edge.smaller)
+
+			// then ask for components of the nodes of removed edge
+			compA := g.ComponentFrom(edge.bigger)
+			compB := g.ComponentFrom(edge.smaller)
+
+			// iterate over the initially removed edges. only two of them should be 'connecting'
+			// i.e were necessary to remove
+			necessaryEdgesCount := 0
+			for initiallyRemovedEdge := range removedEdges.Iter() {
+				endA, endB := initiallyRemovedEdge.bigger, initiallyRemovedEdge.smaller
+				isNonNecessary := (compA.Contains(endA) && compA.Contains(endB)) || (compB.Contains(endA) && compB.Contains(endB))
+				if !isNonNecessary {
+					// log.Printf("with edge %+v test removed, the %+v also seems necessary", edge, initiallyRemovedEdge)
+					necessaryEdgesCount += 1
+				}
+			}
+			// log.Printf("with edge %+v test removed neessary count is %d", edge, necessaryEdgesCount)
+
+			// if we found 2 necessary, then our currently tried edge is the third necesary to remove
+			// and out two components are the searched
+			if necessaryEdgesCount == 2 {
+				return compA.Cardinality() * compB.Cardinality()
+			}
+
+			// in the end add edge back if not fitting
+			g.AddEdge(edge.bigger, edge.smaller)
+		}
+	}
+
+	// now huh. if we didn't find `necessaryEdgesCount == 2`
+	// that means 0, 1 or 3
+
+	return
+}
--- a/day25/graph_test.go
+++ b/day25/graph_test.go
@@ -0,0 +1,96 @@
+package day25
+
+import (
+	"testing"
+
+	mapset "github.com/deckarep/golang-set/v2"
+)
+
+func TestReadFileExample(t *testing.T) {
+	filename := "example"
+	g := ReadGraphFile(filename)
+	t.Logf("read graph %+v", g)
+}
+
+func TestRemoveEdge(t *testing.T) {
+	filename := "example"
+	g := ReadGraphFile(filename)
+	t.Logf("read graph %+v", g)
+
+	g.RemoveEdge("bvb", "hfx")
+	t.Logf("after removing bvb-hfv %+v", g)
+}
+
+func TestCreateExampleMermaid(t *testing.T) {
+	filename := "example"
+	g := ReadGraphFile(filename)
+
+	g.SaveAsMermaid("example-graph.mmd")
+}
+
+func TestComponentOnInitial(t *testing.T) {
+	// should be all nodes
+	filename := "example"
+	g := ReadGraphFile(filename)
+	comp := g.ComponentFrom("bvb")
+	t.Logf("got component %+v", comp)
+	if comp.Cardinality() != len(g.Nodes) {
+		t.Errorf("should have same size!")
+	}
+}
+
+func TestComponentOnMini(t *testing.T) {
+	// should be all nodes
+	filename := "example2"
+	g := ReadGraphFile(filename)
+	comp := g.ComponentFrom("jqt")
+	t.Logf("got component %+v", comp)
+	if comp.Cardinality() == len(g.Nodes) {
+		t.Errorf("should have different size!")
+	}
+}
+
+func TestRemoveAllCycles(t *testing.T) {
+	filename := "example"
+	g := ReadGraphFile(filename)
+	g.SaveAsMermaid("example-before-removing.mmd")
+	t.Logf("initial graph is %+v", g)
+	edges := g.RemoveAllCycles()
+	expectedNecessary := mapset.NewSet[Edge](
+		CreateEdge("hfx", "pzl"),
+		CreateEdge("bvb", "cmg"),
+		CreateEdge("nvd", "jqt"),
+	)
+
+	intersection := expectedNecessary.Intersect(edges)
+	t.Logf("i expect that exactly two will be in intersection %+v", intersection)
+	if intersection.Cardinality() != 2 {
+		panic("huh?")
+		// ok, this is not what i expected.
+		// this is unstable. but i could run it several times? and hopefully luck out?
+	}
+
+	t.Logf("removed edges %+v", edges)
+	t.Logf("after removal graph is %+v", g)
+	g.SaveAsMermaid("example-after-removing.mmd")
+}
+
+func TestSplittingExample(t *testing.T) {
+	filename := "example"
+	g := ReadGraphFile(filename)
+	result := g.TryToSplit()
+	t.Logf("hopefully same as example answer: %d", result)
+}
+
+func TestSplittingInput(t *testing.T) {
+	// kind of brute force
+	result := 0
+	filename := "input"
+
+	for result == 0 {
+		g := ReadGraphFile(filename)
+		result = g.TryToSplit()
+		t.Logf("hopefully as answer: %d", result)
+	}
+
+}
--- a/day25/notes.org
+++ b/day25/notes.org
@@ -0,0 +1,480 @@
+#+title: Notes
+* ok, not so simple
+'how to find 3 edges which if removed split graph into 2 components'
+
+i guess i could find all cycles?
+and then what?
+
+then if i have graph without cycles and all of the removed edges,
+maybe i can figure out how to remove one edge, to make two components, and all (k - 2) edges back in a way that would not connect those components.
+
+well, the cycles maybe should have been broken elsewhere?
+for most cycles - it doesn't matter.
+
+for cycles that break into 2 components, does it?
+
+ok. if i have the no-cycle graph.
+then we can maybe start searching for 'third' edge to remove.
+
+i remove it, i get two components.
+then as a test - exactly two edges when added should connect those components.
+if that happens - i have an answer
+
+sounds good
+** making code to get components.
+now.
+** make method to remove all cycles.
+save the removed edges to slice
+
+i guess could be a method that modifies the graph and returns all removed edges.
+and test that
+** why a node ends up without any edges?
+#+begin_src
+=== RUN   TestRemoveAllCycles
+    graph_test.go:55: initial graph is {Nodes:map[bvb:[bvb : Set{xhk, hfx, ntq}] cmg:[cmg : Set{qnr, nvd, lhk, bvb, rzs}] frs:[frs : Set{qnr, lhk, lsr}] hfx:[hfx : Set{rhn, bvb, pzl, ntq, xhk}] jqt:[jqt : Set{rhn, xhk, nvd, ntq}] lhk:[lhk : Set{nvd, lsr, frs, cmg}] lsr:[lsr : Set{rzs, frs, lhk}] ntq:[ntq : Set{jqt, hfx, bvb, xhk}] nvd:[nvd : Set{lhk}] pzl:[pzl : Set{lsr, hfx, nvd}] qnr:[qnr : Set{nvd, rzs, frs}] rhn:[rhn : Set{bvb, hfx, xhk}] rsh:[rsh : Set{lsr, rzs, frs, pzl}] rzs:[rzs : Set{lsr, rsh, qnr, cmg}] xhk:[xhk : Set{hfx, rhn, bvb, ntq}]]}
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from lsr and neighbors Set{lhk, rzs, frs}
+2023/12/25 08:14:02 initial dfs from lsr to lhk with initial visited Set{lsr}
+2023/12/25 08:14:02 > step from lsr to lhk. visited : Set{lsr}
+2023/12/25 08:14:02 > step from lhk to frs. visited : Set{lsr, lhk}
+2023/12/25 08:14:02 > step from frs to lsr. visited : Set{lhk, frs, lsr}
+2023/12/25 08:14:02 <<<< cycle true, from frs to lsr
+2023/12/25 08:14:02 entering remove edge for frs and lsr
+2023/12/25 08:14:02 removed first [frs : Set{qnr, lhk}]
+2023/12/25 08:14:02 removed second [lsr : Set{lhk, rzs}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from xhk and neighbors Set{hfx, rhn, bvb, ntq}
+2023/12/25 08:14:02 initial dfs from xhk to ntq with initial visited Set{xhk}
+2023/12/25 08:14:02 > step from xhk to ntq. visited : Set{xhk}
+2023/12/25 08:14:02 > step from ntq to jqt. visited : Set{xhk, ntq}
+2023/12/25 08:14:02 > step from jqt to rhn. visited : Set{xhk, ntq, jqt}
+2023/12/25 08:14:02 > step from rhn to bvb. visited : Set{rhn, xhk, ntq, jqt}
+2023/12/25 08:14:02 > step from bvb to xhk. visited : Set{xhk, ntq, jqt, rhn, bvb}
+2023/12/25 08:14:02 <<<< cycle true, from bvb to xhk
+2023/12/25 08:14:02 entering remove edge for bvb and xhk
+2023/12/25 08:14:02 removed first [bvb : Set{hfx, ntq}]
+2023/12/25 08:14:02 removed second [xhk : Set{ntq, hfx, rhn}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rhn and neighbors Set{bvb, hfx, xhk}
+2023/12/25 08:14:02 initial dfs from rhn to xhk with initial visited Set{rhn}
+2023/12/25 08:14:02 > step from rhn to xhk. visited : Set{rhn}
+2023/12/25 08:14:02 > step from xhk to hfx. visited : Set{rhn, xhk}
+2023/12/25 08:14:02 > step from hfx to bvb. visited : Set{rhn, xhk, hfx}
+2023/12/25 08:14:02 > step from bvb to hfx. visited : Set{hfx, rhn, xhk, bvb}
+2023/12/25 08:14:02 <<<< cycle true, from bvb to hfx
+2023/12/25 08:14:02 entering remove edge for bvb and hfx
+2023/12/25 08:14:02 removed first [bvb : Set{ntq}]
+2023/12/25 08:14:02 removed second [hfx : Set{rhn, pzl, ntq, xhk}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rsh and neighbors Set{frs, pzl, lsr, rzs}
+2023/12/25 08:14:02 initial dfs from rsh to frs with initial visited Set{rsh}
+2023/12/25 08:14:02 > step from rsh to frs. visited : Set{rsh}
+2023/12/25 08:14:02 > step from frs to qnr. visited : Set{rsh, frs}
+2023/12/25 08:14:02 > step from qnr to nvd. visited : Set{qnr, rsh, frs}
+2023/12/25 08:14:02 > step from nvd to lhk. visited : Set{rsh, frs, qnr, nvd}
+2023/12/25 08:14:02 > step from lhk to cmg. visited : Set{rsh, frs, qnr, nvd, lhk}
+2023/12/25 08:14:02 > step from cmg to qnr. visited : Set{rsh, frs, qnr, nvd, lhk, cmg}
+2023/12/25 08:14:02 <<<< cycle true, from cmg to qnr
+2023/12/25 08:14:02 entering remove edge for cmg and qnr
+2023/12/25 08:14:02 removed first [cmg : Set{nvd, lhk, bvb, rzs}]
+2023/12/25 08:14:02 removed second [qnr : Set{nvd, rzs, frs}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rzs and neighbors Set{rsh, qnr, cmg, lsr}
+2023/12/25 08:14:02 initial dfs from rzs to cmg with initial visited Set{rzs}
+2023/12/25 08:14:02 > step from rzs to cmg. visited : Set{rzs}
+2023/12/25 08:14:02 > step from cmg to nvd. visited : Set{rzs, cmg}
+2023/12/25 08:14:02 > step from nvd to lhk. visited : Set{cmg, nvd, rzs}
+2023/12/25 08:14:02 > step from lhk to cmg. visited : Set{cmg, lhk, nvd, rzs}
+2023/12/25 08:14:02 <<<< cycle true, from lhk to cmg
+2023/12/25 08:14:02 entering remove edge for lhk and cmg
+2023/12/25 08:14:02 removed first [lhk : Set{frs, nvd, lsr}]
+2023/12/25 08:14:02 removed second [cmg : Set{rzs, nvd, bvb}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from qnr and neighbors Set{nvd, rzs, frs}
+2023/12/25 08:14:02 initial dfs from qnr to nvd with initial visited Set{qnr}
+2023/12/25 08:14:02 > step from qnr to nvd. visited : Set{qnr}
+2023/12/25 08:14:02 > step from nvd to lhk. visited : Set{qnr, nvd}
+2023/12/25 08:14:02 > step from lhk to nvd. visited : Set{lhk, qnr, nvd}
+2023/12/25 08:14:02 <<<< cycle true, from lhk to nvd
+2023/12/25 08:14:02 entering remove edge for lhk and nvd
+2023/12/25 08:14:02 removed first [lhk : Set{lsr, frs}]
+2023/12/25 08:14:02 removed second [nvd : Set{}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from jqt and neighbors Set{rhn, xhk, nvd, ntq}
+2023/12/25 08:14:02 initial dfs from jqt to xhk with initial visited Set{jqt}
+2023/12/25 08:14:02 > step from jqt to xhk. visited : Set{jqt}
+2023/12/25 08:14:02 > step from xhk to ntq. visited : Set{jqt, xhk}
+2023/12/25 08:14:02 > step from ntq to bvb. visited : Set{jqt, xhk, ntq}
+2023/12/25 08:14:02 > step from bvb to ntq. visited : Set{jqt, xhk, ntq, bvb}
+2023/12/25 08:14:02 <<<< cycle true, from bvb to ntq
+2023/12/25 08:14:02 entering remove edge for bvb and ntq
+2023/12/25 08:14:02 removed first [bvb : Set{}]
+2023/12/25 08:14:02 removed second [ntq : Set{jqt, hfx, xhk}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from xhk and neighbors Set{hfx, rhn, ntq}
+2023/12/25 08:14:02 initial dfs from xhk to hfx with initial visited Set{xhk}
+2023/12/25 08:14:02 > step from xhk to hfx. visited : Set{xhk}
+2023/12/25 08:14:02 > step from hfx to xhk. visited : Set{xhk, hfx}
+2023/12/25 08:14:02 <<<< cycle true, from hfx to xhk
+2023/12/25 08:14:02 entering remove edge for hfx and xhk
+2023/12/25 08:14:02 removed first [hfx : Set{ntq, rhn, pzl}]
+2023/12/25 08:14:02 removed second [xhk : Set{rhn, ntq}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from lsr and neighbors Set{lhk, rzs}
+2023/12/25 08:14:02 initial dfs from lsr to rzs with initial visited Set{lsr}
+2023/12/25 08:14:02 > step from lsr to rzs. visited : Set{lsr}
+2023/12/25 08:14:02 > step from rzs to qnr. visited : Set{lsr, rzs}
+2023/12/25 08:14:02 > step from qnr to rzs. visited : Set{lsr, rzs, qnr}
+2023/12/25 08:14:02 <<<< cycle true, from qnr to rzs
+2023/12/25 08:14:02 entering remove edge for qnr and rzs
+2023/12/25 08:14:02 removed first [qnr : Set{frs, nvd}]
+2023/12/25 08:14:02 removed second [rzs : Set{cmg, lsr, rsh}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from pzl and neighbors Set{lsr, hfx, nvd}
+2023/12/25 08:14:02 initial dfs from pzl to lsr with initial visited Set{pzl}
+2023/12/25 08:14:02 > step from pzl to lsr. visited : Set{pzl}
+2023/12/25 08:14:02 > step from lsr to lhk. visited : Set{pzl, lsr}
+2023/12/25 08:14:02 > step from lhk to lsr. visited : Set{lsr, lhk, pzl}
+2023/12/25 08:14:02 <<<< cycle true, from lhk to lsr
+2023/12/25 08:14:02 entering remove edge for lhk and lsr
+2023/12/25 08:14:02 removed first [lhk : Set{frs}]
+2023/12/25 08:14:02 removed second [lsr : Set{rzs}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rhn and neighbors Set{xhk, bvb, hfx}
+2023/12/25 08:14:02 initial dfs from rhn to xhk with initial visited Set{rhn}
+2023/12/25 08:14:02 > step from rhn to xhk. visited : Set{rhn}
+2023/12/25 08:14:02 > step from xhk to rhn. visited : Set{xhk, rhn}
+2023/12/25 08:14:02 <<<< cycle true, from xhk to rhn
+2023/12/25 08:14:02 entering remove edge for xhk and rhn
+2023/12/25 08:14:02 removed first [xhk : Set{ntq}]
+2023/12/25 08:14:02 removed second [rhn : Set{bvb, hfx}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rsh and neighbors Set{frs, pzl, lsr, rzs}
+2023/12/25 08:14:02 initial dfs from rsh to frs with initial visited Set{rsh}
+2023/12/25 08:14:02 > step from rsh to frs. visited : Set{rsh}
+2023/12/25 08:14:02 > step from frs to qnr. visited : Set{rsh, frs}
+2023/12/25 08:14:02 > step from qnr to frs. visited : Set{rsh, frs, qnr}
+2023/12/25 08:14:02 <<<< cycle true, from qnr to frs
+2023/12/25 08:14:02 entering remove edge for qnr and frs
+2023/12/25 08:14:02 removed first [qnr : Set{nvd}]
+2023/12/25 08:14:02 removed second [frs : Set{lhk}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rhn and neighbors Set{bvb, hfx}
+2023/12/25 08:14:02 initial dfs from rhn to hfx with initial visited Set{rhn}
+2023/12/25 08:14:02 > step from rhn to hfx. visited : Set{rhn}
+2023/12/25 08:14:02 > step from hfx to rhn. visited : Set{rhn, hfx}
+2023/12/25 08:14:02 <<<< cycle true, from hfx to rhn
+2023/12/25 08:14:02 entering remove edge for hfx and rhn
+2023/12/25 08:14:02 removed first [hfx : Set{pzl, ntq}]
+2023/12/25 08:14:02 removed second [rhn : Set{bvb}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from pzl and neighbors Set{hfx, nvd, lsr}
+2023/12/25 08:14:02 initial dfs from pzl to lsr with initial visited Set{pzl}
+2023/12/25 08:14:02 > step from pzl to lsr. visited : Set{pzl}
+2023/12/25 08:14:02 > step from lsr to rzs. visited : Set{pzl, lsr}
+2023/12/25 08:14:02 > step from rzs to cmg. visited : Set{pzl, lsr, rzs}
+2023/12/25 08:14:02 > step from cmg to rzs. visited : Set{pzl, lsr, rzs, cmg}
+2023/12/25 08:14:02 <<<< cycle true, from cmg to rzs
+2023/12/25 08:14:02 entering remove edge for cmg and rzs
+2023/12/25 08:14:02 removed first [cmg : Set{nvd, bvb}]
+2023/12/25 08:14:02 removed second [rzs : Set{lsr, rsh}]
+2023/12/25 08:14:02 >>>> starting new find cycle
+2023/12/25 08:14:02 initial search from rhn and neighbors Set{bvb}
+2023/12/25 08:14:02 initial dfs from rhn to bvb with initial visited Set{rhn}
+2023/12/25 08:14:02 > step from rhn to bvb. visited : Set{rhn}
+2023/12/25 08:14:02 <<<< cycle false, from  to
+    graph_test.go:57: removed edges Set{{lhk nvd}, {hfx xhk}, {frs qnr}, {cmg rzs}, {bvb xhk}, {bvb hfx}, {cmg qnr}, {cmg lhk}, {qnr rzs}, {hfx rhn}, {frs lsr}, {rhn xhk}, {bvb ntq}, {lhk lsr}}
+    graph_test.go:58: after removal graph is {Nodes:map[bvb:[bvb : Set{}] cmg:[cmg : Set{nvd, bvb}] frs:[frs : Set{lhk}] hfx:[hfx : Set{pzl, ntq}] jqt:[jqt : Set{rhn, xhk, nvd, ntq}] lhk:[lhk : Set{frs}] lsr:[lsr : Set{rzs}] ntq:[ntq : Set{xhk, jqt, hfx}] nvd:[nvd : Set{}] pzl:[pzl : Set{nvd, lsr, hfx}] qnr:[qnr : Set{nvd}] rhn:[rhn : Set{bvb}] rsh:[rsh : Set{frs, pzl, lsr, rzs}] rzs:[rzs : Set{lsr, rsh}] xhk:[xhk : Set{ntq}]]}
+--- PASS: TestRemoveAllCycles (0.00s)
+
+#+end_src
+*** because i was overwriting nodes on file read
+** now why i get empty sets?
+#+begin_src
+=== RUN   TestRemoveAllCycles
+    graph_test.go:55: initial graph is {Nodes:map[bvb:[bvb : Set{cmg, rhn, xhk, hfx, ntq}] cmg:[cmg : Set{lhk, bvb, rzs, qnr, nvd}] frs:[frs : Set{rsh, qnr, lhk, lsr}] hfx:[hfx : Set{xhk, rhn, bvb, pzl, ntq}] jqt:[jqt : Set{rhn, xhk, nvd, ntq}] lhk:[lhk : Set{nvd, lsr, frs, cmg}] lsr:[lsr : Set{rsh, pzl, lhk, rzs, frs}] ntq:[ntq : Set{jqt, hfx, bvb, xhk}] nvd:[nvd : Set{pzl, qnr, lhk, jqt, cmg}] pzl:[pzl : Set{hfx, nvd, rsh, lsr}] qnr:[qnr : Set{cmg, nvd, rzs, frs}] rhn:[rhn : Set{jqt, xhk, bvb, hfx}] rsh:[rsh : Set{lsr, rzs, frs, pzl}] rzs:[rzs : Set{qnr, cmg, lsr, rsh}] xhk:[xhk : Set{hfx, rhn, bvb, ntq, jqt}]]}
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from xhk and neighbors Set{rhn, bvb, ntq, jqt, hfx}
+2023/12/25 08:31:09 initial dfs from xhk to rhn with initial visited Set{xhk}
+2023/12/25 08:31:09 > step from xhk to rhn. visited : Set{xhk}
+2023/12/25 08:31:09 > step from rhn to jqt. visited : Set{xhk, rhn}
+2023/12/25 08:31:09 > step from jqt to rhn. visited : Set{xhk, rhn, jqt}
+2023/12/25 08:31:09 <<<< cycle true, from jqt to rhn
+2023/12/25 08:31:09 entering remove edge for jqt and rhn
+2023/12/25 08:31:09 before remove first [jqt : Set{xhk, nvd, ntq, rhn}]
+2023/12/25 08:31:09 removed first [jqt : Set{ntq, xhk, nvd}]
+2023/12/25 08:31:09 before remove second [jqt : Set{nvd, ntq, xhk}]
+2023/12/25 08:31:09 removed second [rhn : Set{hfx, xhk, bvb}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from pzl and neighbors Set{hfx, nvd, rsh, lsr}
+2023/12/25 08:31:09 initial dfs from pzl to nvd with initial visited Set{pzl}
+2023/12/25 08:31:09 > step from pzl to nvd. visited : Set{pzl}
+2023/12/25 08:31:09 > step from nvd to jqt. visited : Set{pzl, nvd}
+2023/12/25 08:31:09 > step from jqt to ntq. visited : Set{pzl, nvd, jqt}
+2023/12/25 08:31:09 > step from ntq to xhk. visited : Set{pzl, nvd, jqt, ntq}
+2023/12/25 08:31:09 > step from xhk to jqt. visited : Set{ntq, pzl, nvd, jqt, xhk}
+2023/12/25 08:31:09 <<<< cycle true, from xhk to jqt
+2023/12/25 08:31:09 entering remove edge for xhk and jqt
+2023/12/25 08:31:09 before remove first [xhk : Set{jqt, hfx, rhn, bvb, ntq}]
+2023/12/25 08:31:09 removed first [xhk : Set{ntq, hfx, rhn, bvb}]
+2023/12/25 08:31:09 before remove second [xhk : Set{hfx, rhn, bvb, ntq}]
+2023/12/25 08:31:09 removed second [jqt : Set{nvd, ntq}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from frs and neighbors Set{rsh, qnr, lhk, lsr}
+2023/12/25 08:31:09 initial dfs from frs to lhk with initial visited Set{frs}
+2023/12/25 08:31:09 > step from frs to lhk. visited : Set{frs}
+2023/12/25 08:31:09 > step from lhk to nvd. visited : Set{frs, lhk}
+2023/12/25 08:31:09 > step from nvd to cmg. visited : Set{lhk, frs, nvd}
+2023/12/25 08:31:09 > step from cmg to lhk. visited : Set{frs, nvd, lhk, cmg}
+2023/12/25 08:31:09 <<<< cycle true, from cmg to lhk
+2023/12/25 08:31:09 entering remove edge for cmg and lhk
+2023/12/25 08:31:09 before remove first [cmg : Set{qnr, nvd, lhk, bvb, rzs}]
+2023/12/25 08:31:09 removed first [cmg : Set{nvd, bvb, rzs, qnr}]
+2023/12/25 08:31:09 before remove second [cmg : Set{bvb, rzs, qnr, nvd}]
+2023/12/25 08:31:09 removed second [lhk : Set{nvd, lsr, frs}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from xhk and neighbors Set{hfx, rhn, bvb, ntq}
+2023/12/25 08:31:09 initial dfs from xhk to ntq with initial visited Set{xhk}
+2023/12/25 08:31:09 > step from xhk to ntq. visited : Set{xhk}
+2023/12/25 08:31:09 > step from ntq to jqt. visited : Set{xhk, ntq}
+2023/12/25 08:31:09 > step from jqt to ntq. visited : Set{xhk, ntq, jqt}
+2023/12/25 08:31:09 <<<< cycle true, from jqt to ntq
+2023/12/25 08:31:09 entering remove edge for jqt and ntq
+2023/12/25 08:31:09 before remove first [jqt : Set{ntq, nvd}]
+2023/12/25 08:31:09 removed first [jqt : Set{nvd}]
+2023/12/25 08:31:09 before remove second [jqt : Set{nvd}]
+2023/12/25 08:31:09 removed second [ntq : Set{xhk, hfx, bvb}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from nvd and neighbors Set{jqt, cmg, pzl, qnr, lhk}
+2023/12/25 08:31:09 initial dfs from nvd to cmg with initial visited Set{nvd}
+2023/12/25 08:31:09 > step from nvd to cmg. visited : Set{nvd}
+2023/12/25 08:31:09 > step from cmg to bvb. visited : Set{nvd, cmg}
+2023/12/25 08:31:09 > step from bvb to cmg. visited : Set{cmg, nvd, bvb}
+2023/12/25 08:31:09 <<<< cycle true, from bvb to cmg
+2023/12/25 08:31:09 entering remove edge for bvb and cmg
+2023/12/25 08:31:09 before remove first [bvb : Set{cmg, rhn, xhk, hfx, ntq}]
+2023/12/25 08:31:09 removed first [bvb : Set{xhk, hfx, ntq, rhn}]
+2023/12/25 08:31:09 before remove second [bvb : Set{rhn, xhk, hfx, ntq}]
+2023/12/25 08:31:09 removed second [cmg : Set{rzs, qnr, nvd}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from frs and neighbors Set{rsh, qnr, lhk, lsr}
+2023/12/25 08:31:09 initial dfs from frs to lsr with initial visited Set{frs}
+2023/12/25 08:31:09 > step from frs to lsr. visited : Set{frs}
+2023/12/25 08:31:09 > step from lsr to rzs. visited : Set{frs, lsr}
+2023/12/25 08:31:09 > step from rzs to cmg. visited : Set{frs, lsr, rzs}
+2023/12/25 08:31:09 > step from cmg to rzs. visited : Set{lsr, rzs, cmg, frs}
+2023/12/25 08:31:09 <<<< cycle true, from cmg to rzs
+2023/12/25 08:31:09 entering remove edge for cmg and rzs
+2023/12/25 08:31:09 before remove first [cmg : Set{rzs, qnr, nvd}]
+2023/12/25 08:31:09 removed first [cmg : Set{qnr, nvd}]
+2023/12/25 08:31:09 before remove second [cmg : Set{qnr, nvd}]
+2023/12/25 08:31:09 removed second [rzs : Set{lsr, rsh, qnr}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from ntq and neighbors Set{xhk, hfx, bvb}
+2023/12/25 08:31:09 initial dfs from ntq to bvb with initial visited Set{ntq}
+2023/12/25 08:31:09 > step from ntq to bvb. visited : Set{ntq}
+2023/12/25 08:31:09 > step from bvb to rhn. visited : Set{ntq, bvb}
+2023/12/25 08:31:09 > step from rhn to xhk. visited : Set{bvb, ntq, rhn}
+2023/12/25 08:31:09 > step from xhk to hfx. visited : Set{bvb, ntq, rhn, xhk}
+2023/12/25 08:31:09 > step from hfx to bvb. visited : Set{xhk, bvb, ntq, rhn, hfx}
+2023/12/25 08:31:09 <<<< cycle true, from hfx to bvb
+2023/12/25 08:31:09 entering remove edge for hfx and bvb
+2023/12/25 08:31:09 before remove first [hfx : Set{rhn, bvb, pzl, ntq, xhk}]
+2023/12/25 08:31:09 removed first [hfx : Set{ntq, xhk, rhn, pzl}]
+2023/12/25 08:31:09 before remove second [hfx : Set{pzl, ntq, xhk, rhn}]
+2023/12/25 08:31:09 removed second [bvb : Set{ntq, rhn, xhk}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from rhn and neighbors Set{xhk, bvb, hfx}
+2023/12/25 08:31:09 initial dfs from rhn to bvb with initial visited Set{rhn}
+2023/12/25 08:31:09 > step from rhn to bvb. visited : Set{rhn}
+2023/12/25 08:31:09 > step from bvb to rhn. visited : Set{bvb, rhn}
+2023/12/25 08:31:09 <<<< cycle true, from bvb to rhn
+2023/12/25 08:31:09 entering remove edge for bvb and rhn
+2023/12/25 08:31:09 before remove first [bvb : Set{ntq, rhn, xhk}]
+2023/12/25 08:31:09 removed first [bvb : Set{ntq, xhk}]
+2023/12/25 08:31:09 before remove second [bvb : Set{ntq, xhk}]
+2023/12/25 08:31:09 removed second [rhn : Set{xhk, hfx}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from rhn and neighbors Set{xhk, hfx}
+2023/12/25 08:31:09 initial dfs from rhn to hfx with initial visited Set{rhn}
+2023/12/25 08:31:09 > step from rhn to hfx. visited : Set{rhn}
+2023/12/25 08:31:09 > step from hfx to pzl. visited : Set{rhn, hfx}
+2023/12/25 08:31:09 > step from pzl to rsh. visited : Set{rhn, hfx, pzl}
+2023/12/25 08:31:09 > step from rsh to frs. visited : Set{hfx, pzl, rsh, rhn}
+2023/12/25 08:31:09 > step from frs to qnr. visited : Set{rsh, frs, rhn, hfx, pzl}
+2023/12/25 08:31:09 > step from qnr to cmg. visited : Set{rsh, frs, rhn, hfx, pzl, qnr}
+2023/12/25 08:31:09 > step from cmg to qnr. visited : Set{hfx, pzl, qnr, cmg, rsh, frs, rhn}
+2023/12/25 08:31:09 <<<< cycle true, from cmg to qnr
+2023/12/25 08:31:09 entering remove edge for cmg and qnr
+2023/12/25 08:31:09 before remove first [cmg : Set{qnr, nvd}]
+2023/12/25 08:31:09 removed first [cmg : Set{nvd}]
+2023/12/25 08:31:09 before remove second [cmg : Set{nvd}]
+2023/12/25 08:31:09 removed second [qnr : Set{nvd, rzs, frs}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from lsr and neighbors Set{rsh, pzl, lhk, rzs, frs}
+2023/12/25 08:31:09 initial dfs from lsr to frs with initial visited Set{lsr}
+2023/12/25 08:31:09 > step from lsr to frs. visited : Set{lsr}
+2023/12/25 08:31:09 > step from frs to rsh. visited : Set{lsr, frs}
+2023/12/25 08:31:09 > step from rsh to frs. visited : Set{lsr, frs, rsh}
+2023/12/25 08:31:09 <<<< cycle true, from rsh to frs
+2023/12/25 08:31:09 entering remove edge for rsh and frs
+2023/12/25 08:31:09 before remove first [rsh : Set{frs, pzl, lsr, rzs}]
+2023/12/25 08:31:09 removed first [rsh : Set{rzs, pzl, lsr}]
+2023/12/25 08:31:09 before remove second [rsh : Set{rzs, pzl, lsr}]
+2023/12/25 08:31:09 removed second [frs : Set{qnr, lhk, lsr}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from rhn and neighbors Set{xhk, hfx}
+2023/12/25 08:31:09 initial dfs from rhn to xhk with initial visited Set{rhn}
+2023/12/25 08:31:09 > step from rhn to xhk. visited : Set{rhn}
+2023/12/25 08:31:09 > step from xhk to hfx. visited : Set{rhn, xhk}
+2023/12/25 08:31:09 > step from hfx to pzl. visited : Set{rhn, xhk, hfx}
+2023/12/25 08:31:09 > step from pzl to rsh. visited : Set{rhn, xhk, hfx, pzl}
+2023/12/25 08:31:09 > step from rsh to rzs. visited : Set{rhn, xhk, hfx, pzl, rsh}
+2023/12/25 08:31:09 > step from rzs to rsh. visited : Set{rzs, rsh, rhn, xhk, hfx, pzl}
+2023/12/25 08:31:09 <<<< cycle true, from rzs to rsh
+2023/12/25 08:31:09 entering remove edge for rzs and rsh
+2023/12/25 08:31:09 before remove first [rzs : Set{lsr, rsh, qnr}]
+2023/12/25 08:31:09 removed first [rzs : Set{qnr, lsr}]
+2023/12/25 08:31:09 before remove second [rzs : Set{lsr, qnr}]
+2023/12/25 08:31:09 removed second [rsh : Set{pzl, lsr}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from xhk and neighbors Set{hfx, rhn, bvb, ntq}
+2023/12/25 08:31:09 initial dfs from xhk to hfx with initial visited Set{xhk}
+2023/12/25 08:31:09 > step from xhk to hfx. visited : Set{xhk}
+2023/12/25 08:31:09 > step from hfx to pzl. visited : Set{xhk, hfx}
+2023/12/25 08:31:09 > step from pzl to rsh. visited : Set{xhk, hfx, pzl}
+2023/12/25 08:31:09 > step from rsh to pzl. visited : Set{pzl, xhk, hfx, rsh}
+2023/12/25 08:31:09 <<<< cycle true, from rsh to pzl
+2023/12/25 08:31:09 entering remove edge for rsh and pzl
+2023/12/25 08:31:09 before remove first [rsh : Set{pzl, lsr}]
+2023/12/25 08:31:09 removed first [rsh : Set{lsr}]
+2023/12/25 08:31:09 before remove second [rsh : Set{lsr}]
+2023/12/25 08:31:09 removed second [pzl : Set{lsr, hfx, nvd}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from rsh and neighbors Set{lsr}
+2023/12/25 08:31:09 initial dfs from rsh to lsr with initial visited Set{rsh}
+2023/12/25 08:31:09 > step from rsh to lsr. visited : Set{rsh}
+2023/12/25 08:31:09 > step from lsr to frs. visited : Set{rsh, lsr}
+2023/12/25 08:31:09 > step from frs to qnr. visited : Set{frs, lsr, rsh}
+2023/12/25 08:31:09 > step from qnr to nvd. visited : Set{lsr, rsh, frs, qnr}
+2023/12/25 08:31:09 > step from nvd to jqt. visited : Set{rsh, frs, qnr, nvd, lsr}
+2023/12/25 08:31:09 > step from jqt to nvd. visited : Set{lsr, rsh, frs, qnr, nvd, jqt}
+2023/12/25 08:31:09 <<<< cycle true, from jqt to nvd
+2023/12/25 08:31:09 entering remove edge for jqt and nvd
+2023/12/25 08:31:09 before remove first [jqt : Set{nvd}]
+2023/12/25 08:31:09 removed first [jqt : Set{}]
+2023/12/25 08:31:09 before remove second [jqt : Set{}]
+2023/12/25 08:31:09 removed second [nvd : Set{cmg, pzl, qnr, lhk}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from bvb and neighbors Set{ntq, xhk}
+2023/12/25 08:31:09 initial dfs from bvb to ntq with initial visited Set{bvb}
+2023/12/25 08:31:09 > step from bvb to ntq. visited : Set{bvb}
+2023/12/25 08:31:09 > step from ntq to xhk. visited : Set{bvb, ntq}
+2023/12/25 08:31:09 > step from xhk to hfx. visited : Set{ntq, xhk, bvb}
+2023/12/25 08:31:09 > step from hfx to pzl. visited : Set{bvb, ntq, xhk, hfx}
+2023/12/25 08:31:09 > step from pzl to nvd. visited : Set{pzl, bvb, ntq, xhk, hfx}
+2023/12/25 08:31:09 > step from nvd to qnr. visited : Set{hfx, pzl, nvd, bvb, ntq, xhk}
+2023/12/25 08:31:09 > step from qnr to nvd. visited : Set{pzl, nvd, bvb, ntq, xhk, hfx, qnr}
+2023/12/25 08:31:09 <<<< cycle true, from qnr to nvd
+2023/12/25 08:31:09 entering remove edge for qnr and nvd
+2023/12/25 08:31:09 before remove first [qnr : Set{nvd, rzs, frs}]
+2023/12/25 08:31:09 removed first [qnr : Set{rzs, frs}]
+2023/12/25 08:31:09 before remove second [qnr : Set{frs, rzs}]
+2023/12/25 08:31:09 removed second [nvd : Set{pzl, lhk, cmg}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from pzl and neighbors Set{lsr, hfx, nvd}
+2023/12/25 08:31:09 initial dfs from pzl to lsr with initial visited Set{pzl}
+2023/12/25 08:31:09 > step from pzl to lsr. visited : Set{pzl}
+2023/12/25 08:31:09 > step from lsr to rsh. visited : Set{pzl, lsr}
+2023/12/25 08:31:09 > step from rsh to lsr. visited : Set{pzl, lsr, rsh}
+2023/12/25 08:31:09 <<<< cycle true, from rsh to lsr
+2023/12/25 08:31:09 entering remove edge for rsh and lsr
+2023/12/25 08:31:09 before remove first [rsh : Set{lsr}]
+2023/12/25 08:31:09 removed first [rsh : Set{}]
+2023/12/25 08:31:09 before remove second [rsh : Set{}]
+2023/12/25 08:31:09 removed second [lsr : Set{rzs, frs, pzl, lhk}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from rhn and neighbors Set{xhk, hfx}
+2023/12/25 08:31:09 initial dfs from rhn to xhk with initial visited Set{rhn}
+2023/12/25 08:31:09 > step from rhn to xhk. visited : Set{rhn}
+2023/12/25 08:31:09 > step from xhk to hfx. visited : Set{rhn, xhk}
+2023/12/25 08:31:09 > step from hfx to pzl. visited : Set{hfx, rhn, xhk}
+2023/12/25 08:31:09 > step from pzl to lsr. visited : Set{rhn, xhk, hfx, pzl}
+2023/12/25 08:31:09 > step from lsr to frs. visited : Set{xhk, hfx, pzl, rhn, lsr}
+2023/12/25 08:31:09 > step from frs to qnr. visited : Set{rhn, lsr, xhk, hfx, pzl, frs}
+2023/12/25 08:31:09 > step from qnr to rzs. visited : Set{qnr, rhn, lsr, xhk, hfx, pzl, frs}
+2023/12/25 08:31:09 > step from rzs to lsr. visited : Set{hfx, rzs, pzl, frs, qnr, rhn, lsr, xhk}
+2023/12/25 08:31:09 <<<< cycle true, from rzs to lsr
+2023/12/25 08:31:09 entering remove edge for rzs and lsr
+2023/12/25 08:31:09 before remove first [rzs : Set{lsr, qnr}]
+2023/12/25 08:31:09 removed first [rzs : Set{qnr}]
+2023/12/25 08:31:09 before remove second [rzs : Set{qnr}]
+2023/12/25 08:31:09 removed second [lsr : Set{lhk, frs, pzl}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from frs and neighbors Set{qnr, lhk, lsr}
+2023/12/25 08:31:09 initial dfs from frs to qnr with initial visited Set{frs}
+2023/12/25 08:31:09 > step from frs to qnr. visited : Set{frs}
+2023/12/25 08:31:09 > step from qnr to rzs. visited : Set{frs, qnr}
+2023/12/25 08:31:09 > step from rzs to qnr. visited : Set{frs, qnr, rzs}
+2023/12/25 08:31:09 <<<< cycle true, from rzs to qnr
+2023/12/25 08:31:09 entering remove edge for rzs and qnr
+2023/12/25 08:31:09 before remove first [rzs : Set{qnr}]
+2023/12/25 08:31:09 removed first [rzs : Set{}]
+2023/12/25 08:31:09 before remove second [rzs : Set{}]
+2023/12/25 08:31:09 removed second [qnr : Set{frs}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from frs and neighbors Set{qnr, lhk, lsr}
+2023/12/25 08:31:09 initial dfs from frs to qnr with initial visited Set{frs}
+2023/12/25 08:31:09 > step from frs to qnr. visited : Set{frs}
+2023/12/25 08:31:09 > step from qnr to frs. visited : Set{frs, qnr}
+2023/12/25 08:31:09 <<<< cycle true, from qnr to frs
+2023/12/25 08:31:09 entering remove edge for qnr and frs
+2023/12/25 08:31:09 before remove first [qnr : Set{frs}]
+2023/12/25 08:31:09 removed first [qnr : Set{}]
+2023/12/25 08:31:09 before remove second [qnr : Set{}]
+2023/12/25 08:31:09 removed second [frs : Set{lsr, lhk}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from frs and neighbors Set{lsr, lhk}
+2023/12/25 08:31:09 initial dfs from frs to lhk with initial visited Set{frs}
+2023/12/25 08:31:09 > step from frs to lhk. visited : Set{frs}
+2023/12/25 08:31:09 > step from lhk to nvd. visited : Set{frs, lhk}
+2023/12/25 08:31:09 > step from nvd to cmg. visited : Set{lhk, nvd, frs}
+2023/12/25 08:31:09 > step from cmg to nvd. visited : Set{nvd, cmg, frs, lhk}
+2023/12/25 08:31:09 <<<< cycle true, from cmg to nvd
+2023/12/25 08:31:09 entering remove edge for cmg and nvd
+2023/12/25 08:31:09 before remove first [cmg : Set{nvd}]
+2023/12/25 08:31:09 removed first [cmg : Set{}]
+2023/12/25 08:31:09 before remove second [cmg : Set{}]
+2023/12/25 08:31:09 removed second [nvd : Set{pzl, lhk}]
+2023/12/25 08:31:09 >>>> starting new find cycle
+2023/12/25 08:31:09 initial search from cmg and neighbors Set{}
+2023/12/25 08:31:09 <<<< cycle false, from  to
+    graph_test.go:57: removed edges Set{{frs qnr}, {cmg lhk}, {bvb cmg}, {bvb rhn}, {lsr rzs}, {jqt nvd}, {nvd qnr}, {cmg nvd}, {jqt rhn}, {cmg rzs}, {frs rsh}, {rsh rzs}, {jqt ntq}, {cmg qnr}, {lsr rsh}, {jqt xhk}, {bvb hfx}, {pzl rsh}, {qnr rzs}}
+    graph_test.go:58: after removal graph is {Nodes:map[bvb:[bvb : Set{ntq, xhk}] cmg:[cmg : Set{}] frs:[frs : Set{lhk, lsr}] hfx:[hfx : Set{rhn, pzl, ntq, xhk}] jqt:[jqt : Set{}] lhk:[lhk : Set{nvd, lsr, frs}] lsr:[lsr : Set{frs, pzl, lhk}] ntq:[ntq : Set{bvb, xhk, hfx}] nvd:[nvd : Set{pzl, lhk}] pzl:[pzl : Set{lsr, hfx, nvd}] qnr:[qnr : Set{}] rhn:[rhn : Set{xhk, hfx}] rsh:[rsh : Set{}] rzs:[rzs : Set{}] xhk:[xhk : Set{ntq, hfx, rhn, bvb}]]}
+--- PASS: TestRemoveAllCycles (0.00s)
+PASS
+ok  	sunshine.industries/aoc2023/day25	0.003s
+
+#+end_src
+** kind of bruteforce
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 518391
+    graph_test.go:93: hopefully as answer: 0
+    graph_test.go:93: hopefully as answer: 518391
+    graph_test.go:93: hopefully as answer: 0
--- a/day3/input
+++ b/day3/input
@@ -1,140 +0,0 @@
-..........................380.......................143............................108.............630...........425........................
-....*585..30....217*616..........$...................../....$.................447...........381..................+..........973.............
-.210......*...............639...541..-........830*...........912..........743*.......................828..671........+......*...............
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--- a/day5/input/fertilizer-to-water
+++ b/day5/input/fertilizer-to-water
@@ -1,27 +0,0 @@
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--- a/day5/input/humidity-to-location
+++ b/day5/input/humidity-to-location
@@ -1,39 +0,0 @@
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--- a/day5/input/light-to-temperature
+++ b/day5/input/light-to-temperature
@@ -1,42 +0,0 @@
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--- a/day5/input/seed-to-soil
+++ b/day5/input/seed-to-soil
@@ -1,32 +0,0 @@
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-3630638825 3122528592 2798646
-1725486280 3012647256 109881336
-3232765106 192460045 36910273
-4042213712 4061491177 216624499
-2311667486 3256361891 131181828
-2849273982 3133595970 102505596
-1365732141 2963642997 49004259
-3093408594 3494080959 139356512
-3385585792 1971267128 216906043
-2954083526 56695294 82629774
-1331025381 2483732118 34706760
-3322810356 2450074234 33657884
-3269675379 139325068 53134977
-2704750377 680438751 144523605
-1977777776 824962356 50142191
-929469914 3236101566 20260325
-0 1363064706 224603332
-1835367616 2800384017 134141428
-647524775 2518438878 281945139
-2951779578 1587668038 2303948
-1414736400 1052314826 310749880
-224603332 229370318 422921443
-3036713300 0 56695294
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
efim	572bffc845	removing inputs, didn't know they are secret	2023-12-25 09:39:34 +00:00
efim	b879b6541a	day25: wow, part 1	2023-12-25 09:37:10 +00:00
efim	a9caa4c8f1	day25: removing cycles	2023-12-25 08:44:16 +00:00
efim	dce2d06602	day25: cleanup	2023-12-25 07:53:45 +00:00
efim	9177d35caf	day25: initial graph stuff, with cycles removal not working	2023-12-25 07:53:17 +00:00
efim	665987395f	day24: input system for python z3	2023-12-24 12:36:08 +00:00
efim	5b03b8f156	day24: adding python z3, example	2023-12-24 11:47:22 +00:00
efim	bea82cb548	day24: why slope&shift work, while points dont?	2023-12-24 09:01:27 +00:00
efim	d749979aae	day24, already bad	2023-12-24 08:15:18 +00:00
efim	b6a56554af	day24, example	2023-12-24 07:42:04 +00:00
efim	2f6120fbd8	day23, part2	2023-12-23 15:56:25 +00:00
efim	0c31596018	day23, still bad	2023-12-23 12:54:55 +00:00
efim	28cf35e0e4	day23, example second	2023-12-23 12:00:48 +00:00
efim	7ebb6dee2c	day23: started hardcode of part2, way too slow	2023-12-23 10:19:25 +00:00
efim	44de1377ca	day23, part1	2023-12-23 09:16:04 +00:00
efim	c3acf211c3	day22, rewrite with Set	2023-12-22 13:01:58 +00:00
efim	29528f23ac	day22: bug: not using Set - duplicate supports	2023-12-22 12:45:51 +00:00
efim	8be2fa3844	day22, part2	2023-12-22 12:21:49 +00:00
efim	45d03e5ab3	day22, part1, struggle	2023-12-22 12:19:12 +00:00
efim	2b3c7f4ca6	day22, example	2023-12-22 09:59:41 +00:00
efim	3ede691333	day22: initial block setting	2023-12-22 09:24:43 +00:00
efim	7b34b52e5e	day22, simple block code	2023-12-22 08:44:10 +00:00
efim	99c2269df8	day21, part2, did not like	2023-12-21 13:44:01 +00:00
efim	b10a6250b1	day21: wrong answer AND slow. need to scrap	2023-12-21 12:36:07 +00:00
efim	4cb35dca33	day21: saturation logic, but removing points to early	2023-12-21 12:13:01 +00:00
efim	840773fd16	day21: factor for same coord struct	2023-12-21 10:19:37 +00:00
efim	9a22efd4b3	day21: choking on example	2023-12-21 09:27:41 +00:00
efim	f5ea9e725e	day21: yuck	2023-12-21 08:39:27 +00:00
efim	6a7378c265	day1, part1	2023-12-21 08:30:44 +00:00
efim	5b0f1ab750	day21: example	2023-12-21 08:29:08 +00:00
efim	53930e66ac	day20: more diagramming	2023-12-20 13:52:29 +00:00
efim	727099dbd9	day20, small cleanup	2023-12-20 13:26:34 +00:00
efim	98206fe6d4	day20, part2 done with online LCM calculator	2023-12-20 13:16:13 +00:00
efim	57fdfb01cb	day20: whelp.	2023-12-20 11:14:45 +00:00
efim	1e32ec0988	day20, part1	2023-12-20 10:19:24 +00:00
efim	6c061375ce	day20, examples work in test	2023-12-20 10:16:43 +00:00
efim	f538945dff	day20, modules state comparations	2023-12-20 09:58:40 +00:00
efim	00e60657fa	day20, example 2 first four steps pass	2023-12-20 09:46:22 +00:00
efim	1d7a0ef7b8	day20, receive functions	2023-12-20 08:54:12 +00:00
efim	4974127cef	day20: more reading	2023-12-20 08:10:10 +00:00
efim	9dbc2ca205	day20, starting to read in data with using tests as entry points for checking things	2023-12-20 07:35:51 +00:00
efim	e771ac9d9b	day19, part2, finally	2023-12-19 11:46:16 +00:00
efim	52beb4196f	day19, struggling part2, not quite yet	2023-12-19 11:00:59 +00:00
efim	5f62ea45f7	day19, example	2023-12-19 09:03:03 +00:00
efim	6efd55ae6a	day18, example second parallel	2023-12-19 06:53:49 +00:00
efim	568fdd9a70	day18, example for part 2	2023-12-18 19:46:38 +00:00
efim	6dabe8bc66	day18, another example working	2023-12-18 19:37:17 +00:00
efim	86c9ad7653	day18, struggling	2023-12-18 14:50:51 +00:00
efim	4fc5caf228	day18: example optimized even more	2023-12-18 12:10:22 +00:00
efim	b831e92e1f	day18: example optimized	2023-12-18 11:41:55 +00:00
efim	d799b122ce	day18: reading instructions & hanging	2023-12-18 10:48:27 +00:00
efim	1d027d57fc	day18, part1	2023-12-18 10:30:40 +00:00
efim	49fc57029f	day18, example	2023-12-18 09:41:22 +00:00
efim	955bdc78c1	day17, example2	2023-12-17 13:58:34 +00:00
efim	a7e06e7a6e	day17, part 1 wow.	2023-12-17 13:29:22 +00:00
efim	abca885f20	day17, so many tries for part 1	2023-12-17 13:28:18 +00:00
efim	81b8ddc8b0	day17, example attempt 2	2023-12-17 11:18:48 +00:00
efim	41e32d405b	day17, example	2023-12-17 10:48:51 +00:00
efim	08c20ea6e0	day17, dijkstra doesn't work right? just because if found a shorter path, doesn't mean i don't need to check other directions. i have, because maybe they are not blocked and will provide better solution. so, yikes	2023-12-17 09:22:31 +00:00
efim	ed4abd2d7e	day16: part 2	2023-12-16 07:34:26 +00:00
efim	ee9c2c1ca0	day16, example two	2023-12-16 07:33:28 +00:00
efim	8436426d3a	day16, part1	2023-12-16 07:11:15 +00:00
efim	cb973d60cc	day16, example	2023-12-16 07:09:42 +00:00
efim	d09a8af5db	day15, part2	2023-12-15 15:05:19 +00:00
efim	6e623b617e	day15, example two	2023-12-15 15:04:50 +00:00
efim	bd45c334b0	day15, part1	2023-12-15 14:15:18 +00:00
efim	192ff3878e	day15, example	2023-12-15 14:13:36 +00:00
efim	b5cb827be2	day14, part2	2023-12-14 11:57:31 +00:00
efim	149b753d22	day14, example two	2023-12-14 11:56:42 +00:00
efim	709f4c0532	day14, too slow. need memo?	2023-12-14 11:47:03 +00:00
efim	fde1415f34	day14, example	2023-12-14 11:30:03 +00:00
efim	3128ab673f	day13, part2 had a bug in 'recording' the failed lines for Vertical. debugged at second field in input, which was marking only 1 column as having 1 smudge	2023-12-13 15:05:46 +00:00
efim	85dd9a31e3	day13, example two	2023-12-13 14:33:14 +00:00
efim	d4c162db33	day13, part1	2023-12-13 14:11:02 +00:00
efim	adcb2417ff	day13, example	2023-12-13 14:09:58 +00:00
efim	4d346a23db	day12, part2	2023-12-13 02:41:08 +00:00
efim	6398a4d468	day12, counts but too slow	2023-12-13 02:35:41 +00:00
efim	42b587918e	day12, example part 2	2023-12-12 15:47:48 +00:00
efim	c187a03076	day12, part1	2023-12-12 15:33:56 +00:00
efim	cdf5a38512	day12, example optimized	2023-12-12 15:07:31 +00:00
efim	3a43f90431	day12, example	2023-12-12 15:05:09 +00:00
efim	7032666476	day11, part2	2023-12-11 11:23:06 +00:00
efim	65d6c13016	day1, example	2023-12-11 11:15:19 +00:00
				`@@ -0,0 +1 @@`
				`rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7`