Day 15 part 1

2024/src/main/kotlin/Grid.kt

@@ -16,6 +16,14 @@ operator fun <T> Grid<T>.set(coordinate: Grid.Coordinate, value: T) = set(coordi
 operator fun <T> Grid<T>.get(coordinate: Grid.Coordinate) = get(coordinate.x, coordinate.y)
 operator fun <T> Grid<T>.contains(coordinate: Grid.Coordinate) = inside(coordinate)
 
+fun <T> Grid<T>.coordinates() = sequence {
+    for (y in 0..<height) {
+        for (x in 0..<width) {
+            yield(Grid.Coordinate(x, y))
+        }
+    }
+}
+
 class ListGrid<T>(override val width: Int, override val height: Int,  content: List<T>) : Grid<T> {
     init {
         assert(width * height == content.count())

2024/src/main/kotlin/day15.kt

@@ -0,0 +1,55 @@
+fun main() {
+    val iterator = readInput("day15.txt").iterator()
+    val input = Sequence { iterator }
+
+    val grid = CharGrid(input.takeWhile { it.isNotEmpty() }.toList())
+    var robot = grid.find('@')!!
+
+    val program = input.flatMap { line ->
+        line.map {
+            when (it) {
+                '^' -> Direction.North
+                '>' -> Direction.East
+                'v' -> Direction.South
+                '<' -> Direction.West
+                else -> error("Invalid direction $it")
+            }
+        }
+    }
+
+    grid[robot] = '.'
+    for (direction in program) {
+        val next = robot.step(direction)
+        if (grid.push(next, direction)) {
+            robot = next
+        }
+    }
+
+    val part1 = grid.coordinates()
+        .filter { grid[it] == 'O' }
+        .fold(0) { acc, coord ->
+            acc + coord.x + 100 * coord.y
+        }
+
+    println("Part 1: $part1")
+}
+
+fun CharGrid.push(position: Grid.Coordinate, direction: Direction): Boolean {
+    if (this[position] == '.') {
+        return true
+    }
+
+    var next = position
+    while (this[next] == 'O') {
+        next = next.step(direction)
+    }
+
+    if (this[next] == '#') {
+        return false
+    }
+
+    this[next] = 'O'
+    this[position] = '.'
+
+    return true
+}

2024/src/main/resources/day15.txt

@@ -0,0 +1,71 @@
+##################################################
+#...#......O.........#O.....O#.....O.........O..##
+#.O.O#...O#O...O#...OO.#...O......OO#O.O...OO....#
+#...O..#O.....#.....O.....O..O.....OOO....O......#
+#.O..O.#O.O......OO..O.O....O...O...#.#........O.#
+#OO..#..O.O.....O...#.O....O.........#.OOO....OO.#
+#.OO.O........#.O....OO........OO.O...#O...O#..OO#
+##........O.O.O..#....#.......OOOO..O...O#..OO..O#
+#......O##.#O.OO.#...O.#.O.O....O.....OOO...#OO..#
+#.OOOO.OO..O.OOOO...OOO.......#.#...OO.OO....#.O##
+#........OO.#O.O.#.O..O..O.....O.#..O..O...OOO..##
+#...#.OO#.......#.O.OO..O....O.#.....O...O#.####.#
+#.....OO..O.#.O..O.O.##.O..#OO.O...O.O..OO#...#..#
+#O.OOOOO...OOO..#....O#.....O.....O.O.O...O...OO.#
+#...O.....OO.O.......O..#O....O......O.O.O...OO..#
+#.O...OO.O.O..O#........#..O##...#.O#..O.OO.#O.#.#
+#O.O.....#...OO.O....O..O.OO......O..OO.OO..#.O.##
+#..O......OO#.O..O.OO...O..O.O..O..........O..O..#
+#O..#......OO.O...........O....O...O...O...O...O.#
+##.##..O..O...O.#OO.O.O.O#OO..O.O.#OO......O.OO..#
+#..OOO.O....OOO.O....O...O..O.O..O.O.O.#O...#O...#
+#.....O..O.O...O.O..O....O.O...O...#OOOOO...O..O.#
+#.OO..OO....O.OO....OO...O........O.O.O.OO...OOO.#
+##.O.#.....O.O.O..O.O....O..O....O.O..#.O...O....#
+#.#......O#O...#O..O....@O..O......O......O#.....#
+#....O.#.O...#.........O..#.#....#O...OOO.OOOOO..#
+#O.O..O#...OO............O##....O...O#..#O..O..#.#
+#O.OOO.....OO#..O.O...OOO#.O.#.O.O..#.O.O.O......#
+#....O......#O......#..#...O..O...O.##.OOO..O..O.#
+#....O.O....O.O.OO........##...O.#..#...O....O...#
+#......OO.O.....OO...OO.#.#.#O#.OO#OOO.OO.O....#.#
+#O..OO....O.....O..#OO......O.#..O.......#.....#.#
+#...OO..OO....O.#.O.O.#.O#.......O..#..O..O...OO##
+#....O.O.O.......O.##.O...#.......O....O......O.O#
+#....#.#.O.O..#...O..O.#......O.OO#......OOOO..#.#
+#.OO###.OOO.O...O.O....O.....O.....OO....OOO...O.#
+#..O...O.O##O.....#......O....OO....O......OO.O..#
+#.O..O.O...O.O......O.OO.#.O....O.O...O...O.O..O.#
+#..O.OO..OO#.........OO.....O#O..O.#.O.O........O#
+#.O.O...O.O..#.O...O#.O........OO.#..O..O.O.O....#
+#.......O...#.O.....O.O#.O....#.......#.....#....#
+#.#..O....O..OO#...O.O..#..O.O....O..O#O...O.....#
+#..#.#O#.....OO..OO.O.......OO.#...OO...O......O.#
+#O#..O..O..O..#.#.O#...O.OOO...O#....O..#O#...O.##
+#..OOO.O......O...O..O....O#OO.O..O....O....O....#
+#O.O......#..O..#OO....###.O.....O#..O.........O.#
+#O.O.O..#O....O..#.....O..O....OO....#O.....O....#
+#....OO..O.OO.....O.....#.O.......#.O...........O#
+#.....O..O...........O.O..#......O........OO.....#
+##################################################
+
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