Day20

src/day20/day20.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"AOC2021/src/helper"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	args := os.Args[1:]
+	input, err := helper.GetInput(args[0])
+	if err != nil {
+		fmt.Println(err)
+	}
+	enchanceAlg := input[0]
+	picture := make([][]rune, len(input[2:]))
+	for i, row := range input[2:] {
+		picture[i] = []rune(row)
+	}
+
+	for i := 0; i < 50; i++ {
+		if i%2 == 0 {
+			picture = padPicture(picture, 10)
+		}
+		picture = enhancePicture(picture, enchanceAlg)
+		if i%2 == 1 {
+			picture = removeBorder(picture, 1)
+		}
+	}
+	printPicture(picture)
+	fmt.Println(countPixel(picture))
+}
+
+func enhancePicture(picture [][]rune, enchanceAlg string) [][]rune {
+	newPicture := make([][]rune, len(picture))
+	for i := 0; i < len(newPicture); i++ {
+		newPicture[i] = make([]rune, len(picture[0]))
+		for j := 0; j < len(newPicture[i]); j++ {
+			newPicture[i][j] = rune(enchanceAlg[enchancePoint(picture, j, i)])
+		}
+	}
+	return newPicture
+}
+
+func padPicture(picture [][]rune, n int) [][]rune {
+	newPicture := make([][]rune, len(picture)+n*2)
+	for i := 0; i < n; i++ {
+		newPicture[i] = []rune(strings.Repeat(".", len(picture)+n*2))
+	}
+	for i := len(newPicture) - 1; i > len(newPicture)-n-1; i-- {
+		newPicture[i] = []rune(strings.Repeat(".", len(picture)+n*2))
+	}
+	for i := n; i < len(newPicture)-n; i++ {
+		newPicture[i] = []rune(strings.Repeat(".", n) + string(picture[i-n]) + strings.Repeat(".", n))
+	}
+	return newPicture
+}
+
+func removeBorder(picture [][]rune, n int) [][]rune {
+	var newPicture [][]rune
+	for _, row := range picture[n : len(picture)-n] {
+		newPicture = append(newPicture, row[n:len(row)-n])
+	}
+	return newPicture
+}
+
+func enchancePoint(picture [][]rune, x int, y int) int {
+	points := [9][2]int{{-1, -1}, {-1, 0}, {-1, 1}, {0, -1}, {0, 0}, {0, 1}, {1, -1}, {1, 0}, {1, 1}}
+	var binaryNumber []rune
+	for _, direction := range points {
+		px := x + direction[1]
+		py := y + direction[0]
+		binaryPart := '0'
+		if py < len(picture) && py >= 0 && px < len(picture[0]) && px >= 0 {
+			if picture[py][px] == '#' {
+				binaryPart = '1'
+			}
+		}
+		binaryNumber = append(binaryNumber, binaryPart)
+	}
+	if i, err := strconv.ParseInt(string(binaryNumber), 2, 0); err != nil {
+		return -1
+	} else {
+		return int(i)
+	}
+}
+
+func printPicture(picture [][]rune) {
+	fmt.Println("holla")
+	for _, row := range picture {
+		fmt.Println(string(row))
+	}
+	fmt.Println()
+}
+
+func countPixel(picture [][]rune) int {
+	sum := 0
+	for _, row := range picture {
+		for _, char := range row {
+			if char == '#' {
+				sum++
+			}
+		}
+	}
+	return sum
+}

src/day20/day20Input.txt

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src/day20/day20Test.txt

@@ -0,0 +1,7 @@
+..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
+
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+#....
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+..#..
+..###

src/day20/day20Test2.txt

@@ -0,0 +1,5 @@
+#..#.
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