day18: example optimized

day18/lagoon.go

@@ -13,7 +13,7 @@ func Run() int {
 	log.Println("hello day 18")
 	log.Println("problem of lagoon bgins")
 	filename := "day18/example"
-	instructions := ReadInstructionas2(filename)
+	instructions := ReadInstructionas(filename)
 	h, w := calcHeightWidth(instructions)
 	log.Printf("read %+v instructions", instructions)
 
@@ -21,19 +21,22 @@ func Run() int {
 	log.Println("created field")
 
 	// fmt.Println(field.String())
-	field.digByInstructions(instructions)
+	borderAmount := field.digByInstructions(instructions)
 
-	// fmt.Println(field.String())
+	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
 
-	field.digInsides()
+	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
 
-	return field.countDugOut()
+	//  field.countDugOut()
+	return borderAmount + insideAmount
 }
 
 // determine size of field. max(sum(up), sum(down)) for height,
@@ -50,10 +53,13 @@ func Run() int {
 // last part is filling in isides, should be ok with horizontal scans from left by even crossings
 
 type Direction int
-const (Upward Direction = iota
+
+const (
+	Upward Direction = iota
 	Downward
 	Leftward
-Rightward)
+	Rightward
+)
 
 func (d Direction) opposite() Direction {
 	switch d {
@@ -133,10 +139,14 @@ func ReadInstruction2(line string) Instruction {
 	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
+	case "0":
+		direction = Rightward
+	case "1":
+		direction = Downward
+	case "2":
+		direction = Leftward
+	case "3":
+		direction = Upward
 	}
 
 	dist, err := strconv.ParseUint(hexDist, 16, 64)
@@ -176,6 +186,7 @@ func calcHeightWidth(instructions []Instruction) (height, width int) {
 type Coord struct {
 	X, Y int
 }
+
 func (c Coord) applyDirection(d Direction) Coord {
 	switch d {
 	case Upward:
@@ -194,7 +205,6 @@ func (c Coord)applyDirection(d Direction) Coord {
 type Cell struct {
 	IsDug   bool
 	ToBeDug bool
-	Walls map[Direction]string
 	Coord   Coord
 }
 type Field struct {
@@ -207,11 +217,9 @@ func CreateField(height, width int) Field {
 	for i := 0; i < height; i++ {
 		row := make([]*Cell, width)
 		rows[i] = row
-		for j := 0; j < width; j++ {
-			row[j] = &Cell{
-				Walls: make(map[Direction]string),
-			}
-		}
+		// for j := 0; j < width; j++ {
+		// 	row[j] = &Cell{}
+		// }
 	}
 	return Field{
 		Height: height, Width: width,
@@ -225,17 +233,23 @@ func (f *Field)coordToIndices(c Coord) (row, col int) {
 	return
 }
 
-func (f *Field)digByInstructions(instructions []Instruction) {
+func (f *Field) digByInstructions(instructions []Instruction) (borderAmount int) {
 	runnerCoord := Coord{X: 0, Y: 0}
 	row, col := f.coordToIndices(runnerCoord)
-	f.Cells[row][col].IsDug = true
+	f.Cells[row][col] = &Cell{
+		IsDug: true,
+	}
+	// borderAmount += 1
 
 	for _, instruction := range instructions {
 		log.Printf("starting instruction %+v", instruction)
 		for i := 0; i < instruction.Steps; i++ {
 			runnerCoord = runnerCoord.applyDirection(instruction.Direction)
 			row, col := f.coordToIndices(runnerCoord)
-			f.Cells[row][col].IsDug = true
+			f.Cells[row][col] = &Cell{
+				IsDug: true,
+			}
+			borderAmount += 1
 		}
 	}
 	return
@@ -244,19 +258,18 @@ func (f *Field)digByInstructions(instructions []Instruction) {
 func (f *Field) String() string {
 	s := "text 15,15 \""
 	firstNonemptyRow, lastNonemptyRow := 0, 0
+	log.Print("just use", firstNonemptyRow, lastNonemptyRow)
 	seenInRows := false
 	firstNonemptyCol, lastNonemptyCol := 0, 0
 	seenInCols := false
 
 	for i, row := range f.Cells {
 		seenInRow := false
-		for _, cell := range row {
-			if cell.IsDug {
+		for j := 0; j < len(row); j++ {
+			if f.isCellDug(i, j) {
 				seenInRow = true
-			} else {
 			}
 		}
-
 		seenInRows = seenInRows || seenInRow
 		if seenInRow {
 			lastNonemptyRow = i
@@ -269,8 +282,7 @@ func (f *Field)String() string {
 	for col := 0; col < f.Width; col++ {
 		seenInCol := false
 		for row := 0; row < f.Height; row++ {
-			cell := f.Cells[row][col]
-			if cell.IsDug {
+			if f.isCellDug(row, col) {
 				seenInCol = true
 			}
 		}
@@ -284,16 +296,17 @@ func (f *Field)String() string {
 	}
 
 	rowLen := lastNonemptyCol - firstNonemptyCol + 1
-	for i := firstNonemptyRow; i <= lastNonemptyRow; i++ {
-		rowChars := make([]rune, rowLen)
-		for col := firstNonemptyCol; col <= lastNonemptyCol; col++ {
+	log.Print(rowLen)
+	for i := 0; i <= f.Height-1; i++ {
+		rowChars := make([]rune, f.Width)
+		for col := 0; col <= f.Width-1; col++ {
 			cell := f.Cells[i][col]
-			if cell.IsDug {
-				rowChars[col-firstNonemptyCol] = '#'
-			} else if cell.ToBeDug {
-				rowChars[col-firstNonemptyCol] = '@'
+			if cell != nil && cell.ToBeDug {
+				rowChars[col] = '@'
+			} else if f.isCellDug(i, col) {
+				rowChars[col] = '#'
 			} else {
-				rowChars[col-firstNonemptyCol] = '.'
+				rowChars[col] = '.'
 			}
 		}
 
@@ -304,18 +317,17 @@ func (f *Field)String() string {
 	return s
 }
 
-func (f *Field)digInsides() {
-	for row := 0; row < f.Height; row++ {
+func (f *Field) digInsides() (countInside int) {
+	for row := 1; row < f.Height-1; row++ {
 		isInside := false
 		seenUp, seenDown := false, false // for detecting L---7 walls
 		for col := 0; col < f.Width-1; col++ {
-			cellPtr := f.Cells[row][col]
-			rightCell := f.Cells[row][col+1]
-			if cellPtr.IsDug {
-				upCell := f.Cells[row-1][col]
-				downCell := f.Cells[row+1][col]
-				if !rightCell.IsDug {
-					if (upCell.IsDug && seenDown) || (downCell.IsDug && seenUp) {
+			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
@@ -323,31 +335,41 @@ func (f *Field)digInsides() {
 			} else {
 				// not a dug out cell, maybe inside and needs to be dug out
 				if isInside {
-					cellPtr.ToBeDug = true
-				}
-				if rightCell.IsDug {
-					nextUpCell := f.Cells[row-1][col+1]
-					nextDownCell := f.Cells[row+1][col+1]
-					seenUp = nextUpCell.IsDug
-					seenDown = nextDownCell.IsDug
+					f.Cells[row][col] = &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)
 				}
 
-func (f *Field)countDugOut() (result int) {
-	for _, row := range f.Cells {
-		for _, cell := range row {
-			if cell.IsDug || cell.ToBeDug {
-				result += 1
 			}
 		}
 	}
 	return
 }
 
+func (f *Field) isCellDug(row, col int) bool {
+	cell := f.Cells[row][col]
+	return cell != nil && cell.IsDug
+}
+
+// func (f *Field)countDugOut() (result int) {
+// 	for _, row := range f.Cells {
+// 		for _, cell := range row {
+// 			if cell.IsDug || cell.ToBeDug {
+// 				result += 1
+// 			}
+// 		}
+// 	}
+// 	return
+// }
+
 func WriteToFile(filename string, content string) {
 	fileBorder, err := os.Create(filename)
 	if err != nil {