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+###...#.....................#...#...............#.....#.......#...#####...#.............#.........#...#...#.....#...........#...#...#...#...# +############################################################################################################################################# \ No newline at end of file diff --git a/20/main.go b/20/main.go new file mode 100644 index 0000000..09c2133 --- /dev/null +++ b/20/main.go @@ -0,0 +1,235 @@ +package main + +import ( + "bufio" + "fmt" + "os" + "time" +) + +const FILE_PATH = "./input.txt" + +//const FILE_PATH = "./sample.txt" + +func LoadInput(filename string) ([]string, error) { + file, err := os.Open(filename) + if err != nil { + return nil, err + } + defer file.Close() + + var lines []string + scanner := bufio.NewScanner(file) + for scanner.Scan() { + lines = append(lines, scanner.Text()) + } + + if err := scanner.Err(); err != nil { + return nil, err + } + + return lines, nil +} + +type Vector2 struct { + x int + y int +} + +func add(a Vector2, b Vector2) Vector2 { + return Vector2{a.x + b.x, a.y + b.y} +} + +var MOVEMENTS = []Vector2{ + {0, 1}, + {1, 0}, + {0, -1}, + {-1, 0}, +} + +const ( + EMPTY = iota + WALL = iota +) + +type Maze struct { + field [][]int + start Vector2 + end Vector2 +} + +type structuredInput = Maze + +func TransformInput(lines []string) structuredInput { + var field = make([][]int, len(lines)) + var start Vector2 + var end Vector2 + + for y := 0; y < len(lines); y++ { + field[y] = make([]int, len(lines[y])) + for x := 0; x < len(lines[y]); x++ { + if lines[y][x] == '#' { + field[y][x] = WALL + } else { + field[y][x] = EMPTY + } + + if lines[y][x] == 'S' { + start = Vector2{x, y} + } else if lines[y][x] == 'E' { + end = Vector2{x, y} + } + } + } + + return Maze{field, start, end} +} + +func getLowestIndex(score [][]int, poss []Vector2) int { + var index = 0 + var value = score[poss[0].y][poss[0].x] + + for i := 1; i < len(poss); i++ { + if score[poss[i].y][poss[i].x] < value { + index = i + value = score[poss[i].y][poss[i].x] + } + } + + return index +} + +func findShortestLength(field [][]int, start Vector2, end Vector2) int { + if start == end { + return 0 + } + + var poss = []Vector2{start} + var score = make([][]int, len(field)) + for y := 0; y < len(field); y++ { + score[y] = make([]int, len(field[y])) + for x := 0; x < len(field[y]); x++ { + score[y][x] = -1 + } + } + score[start.y][start.x] = 0 + + var index int + var point Vector2 + var next Vector2 + for len(poss) > 0 { + index = getLowestIndex(score, poss) + point = poss[index] + poss = append(poss[:index], poss[index+1:]...) + + for i := 0; i < 4; i++ { + next = add(point, MOVEMENTS[i]) + if field[next.y][next.x] == EMPTY && score[next.y][next.x] == -1 { + if next == end { + return score[point.y][point.x] + 1 + } + score[next.y][next.x] = score[point.y][point.x] + 1 + poss = append(poss, next) + } + } + } + + return -1 +} + +func Part1(input structuredInput) int { + var result = 0 + + var baseSpeed = findShortestLength(input.field, input.start, input.end) + var tempSpeed int + + for y := 1; y < len(input.field[y])-1; y++ { + for x := 1; x < len(input.field[x])-1; x++ { + if input.field[y][x] == WALL { + input.field[y][x] = EMPTY + tempSpeed = findShortestLength(input.field, input.start, input.end) + + if baseSpeed-tempSpeed >= 100 { + result++ + } + + input.field[y][x] = WALL + } + } + } + + return result +} + +const RANGE = 20 + +func iabs(value int) int { + if value < 0 { + return value * -1 + } + return value +} + +func Part2(input structuredInput) int { + var result = 0 + + var baseSpeed = findShortestLength(input.field, input.start, input.end) + + var lengthToEnd = make([][]int, len(input.field)) + var lengthToPoint = make([][]int, len(input.field)) + + for y := 0; y < len(input.field); y++ { + lengthToEnd[y] = make([]int, len(input.field[y])) + lengthToPoint[y] = make([]int, len(input.field[y])) + for x := 0; x < len(input.field[y]); x++ { + if input.field[y][x] == EMPTY { + lengthToEnd[y][x] = findShortestLength(input.field, Vector2{x, y}, input.end) + lengthToPoint[y][x] = findShortestLength(input.field, input.start, Vector2{x, y}) + } + } + } + + var speedToFinish int + + for y1 := 0; y1 < len(input.field); y1++ { + for x1 := 0; x1 < len(input.field[y1]); x1++ { + if input.field[y1][x1] == EMPTY { + for y2 := max(y1-RANGE, 0); y2 < min(y1+RANGE+1, len(input.field)); y2++ { + for x2 := max(x1-RANGE, 0); x2 < min(x1+RANGE+1, len(input.field[y2])); x2++ { + if iabs(y2-y1)+iabs(x2-x1) <= RANGE && input.field[y2][x2] == EMPTY { + speedToFinish = lengthToPoint[y1][x1] + iabs(y2-y1) + iabs(x2-x1) + lengthToEnd[y2][x2] + if baseSpeed-speedToFinish >= 100 { + result++ + } + } + } + } + } + } + } + + return result +} + +func main() { + var start time.Time + var elapsed time.Duration = 0 + input, err := LoadInput(FILE_PATH) + if err != nil { + fmt.Println("Error loading input:", err) + return + } + + structuredInput := TransformInput(input) + fmt.Println("Structured Input:", structuredInput) + + start = time.Now() + //fmt.Println("Solution Part 1: ", Part1(structuredInput)) + elapsed = time.Since(start) + fmt.Printf("Part 1 took %s\n", elapsed) + + start = time.Now() + fmt.Println("Solution Part 2: ", Part2(structuredInput)) + elapsed = time.Since(start) + fmt.Printf("Part 2 took %s\n", elapsed) +} diff --git a/20/sample.txt b/20/sample.txt new file mode 100644 index 0000000..f107d40 --- /dev/null +++ b/20/sample.txt @@ -0,0 +1,15 @@ +############### +#...#...#.....# +#.#.#.#.#.###.# +#S#...#.#.#...# +#######.#.#.### +#######.#.#...# +#######.#.###.# +###..E#...#...# +###.#######.### +#...###...#...# +#.#####.#.###.# +#.#...#.#.#...# +#.#.#.#.#.#.### +#...#...#...### +############### \ No newline at end of file