day10, example last

day10/dayTen.go

@@ -41,6 +41,13 @@ func Run() int {
 	// fmt.Println(fieldMap.String())
 	fmt.Println("beore marking closest Outer:")
 	// now main loop is closed with regards to 'S' neighbors
+
+
+	// TODO Hardcode change S to correct Title
+	fixedBeast := fieldMap.Cells[fieldMap.BeastCoord]
+	fixedBeast.Tile = '7'
+	fieldMap.Cells[fieldMap.BeastCoord] = fixedBeast
+
 	fieldMap.countIntersectionsTopDown()
 	// fieldMap.initialMarkOuter()
 	fmt.Println("after marking closest Outer:")
@@ -140,6 +147,7 @@ type Map struct {
 
 func (m *Map) String() string {
 	result := ""
+	result += fmt.Sprintf("map of height %d and with %d\n", m.Height, m.Width)
 	for y := 0; y < m.Height; y++ {
 		for x := 0; x < m.Width; x++ {
 			cell := m.Cells[Coord{x, y}]
@@ -270,7 +278,9 @@ func Read(filename string) Map {
 	if err != nil {
 		panic(fmt.Sprint("cannot read file ", filename))
 	}
-	lines := strings.Split(string(bytes), "\n")
+	text := string(bytes)
+	text = strings.TrimSpace(text)
+	lines := strings.Split(text, "\n")
 	result.Height = len(lines)
 	result.Width = len(lines[0])
 	result.Cells = map[Coord]Cell{}
@@ -351,30 +361,78 @@ func (c *Cell) OutDirections() []Direction {
 }
 
 func (m *Map)countIntersectionsTopDown() {
-	buffer := make([][]int, m.Height)
+	stacks := make([][]rune, m.Width) // stack for each X
 	for y := 0; y < m.Height; y++ {
-		buffer[y] = make([]int, m.Width)
 		for x := 0; x < m.Width; x++ {
-			if y > 0 {
-				buffer[y][x] = buffer[y-1][x]
-			}
+			stack := stacks[x]
+			len := len(stack)
 			cell := m.Cells[Coord{x, y}]
-			if !cell.IsOnMainPath && buffer[y][x] % 2 == 0 {
-				log.Printf("not main path y=%d x=%d cell is even", y, x)
-				m.markOuter(cell.Coord)
-			}
-			pathEnds := !slices.Contains(cell.OutDirections(), DOWN)
-			if cell.IsOnMainPath && pathEnds {
-				log.Printf("iter y=%d x=%d increasing for %+v\n", y, x, cell)
-				if y > 0 {
-					buffer[y][x] = buffer[y-1][x] + 1
+			if cell.IsOnMainPath {
+				if len == 0 {
+					stack = append(stack, cell.Tile)
 				} else {
-					buffer[y][x] = 1
+					top := stack[len-1]
+					if isOpposite(top, cell.Tile) {
+						stack = stack[:len-1]
+					} else if isScrunching(top, cell.Tile) {
+						stack = stack[:len-1]
+						stack = append(stack, '-')
+						stack, _ = popTwoHorizontals(stack)
+					} else if cell.Tile != '|' {
+						stack = append(stack, cell.Tile)
+					}
+				}
+				stacks[x] = stack
+			} else {
+				if len == 0 {
+					m.markOuter(cell.Coord)
 				}
 			}
 		}
 	}
 
-	fmt.Println(buffer)
-
+	for x := 0; x < m.Width; x++ {
+		stack := stacks[x]
+		fmt.Println(string(stack))
+	}
+	fmt.Print(stacks)
+}
+
+func popTwoHorizontals(stack []rune) ([]rune, bool) {
+	len := len(stack)
+	if len >= 2 {
+		top := stack[len-1]
+		prev := stack[len-2]
+		if top == '-' && prev == '-' {
+			return stack[:len-2], true
+		}
+	}
+	
+	return stack, false
+}
+
+func isScrunching(pipe, other rune) bool {
+	switch pipe {
+	case 'F':
+		return other == 'J'
+	case '7':
+		return other == 'L'
+	}
+	return false
+}
+
+func isOpposite(pipe, other rune) bool {
+	switch pipe {
+	case '-':
+		return other == '-'
+	case 'L':
+		return other == 'F'
+	case 'J':
+		return other == '7'
+	case 'F':
+		return other == 'L'
+	case '7':
+		return other == 'J'
+	}
+	return false
 }

day10/notes.org

@@ -157,3 +157,12 @@ and some elements take off?
 ** ok, one more attempt?
 not counting, but maintaining a stack?
 and opposite angles take the element off the stack?
+
+so - takes off -
+and any left braket takes off any right bracket
+
+and two bottom angles shouldn't be allowed to counteract one another, but top & bottom should be balanced anyway
+** uh. so many more updates.
+and i'll need to owerwrite S to it's value somehow
+
+i will change the S myself. by hardcode