day 17

src/main/kotlin/me/gergo/Aoc17.kt

@@ -0,0 +1,176 @@
+package me.gergo
+
+import java.io.File
+import kotlin.math.max
+
+fun main() {
+    val jets = File("src/main/resources/input17.txt").readText().toCharArray().map {
+        when (it) {
+            '>' -> +1
+            '<' -> -1
+            else -> throw UnsupportedOperationException()
+        }
+    }
+    val rocks = mutableListOf<Rock>()
+    val rockTypes = RockType.values()
+    // val iterations = 2022L // Part One
+    val iterations = 1000000000000L // Part Two
+
+    var rockIndex = 0L
+    var jetIndex = 0
+    var skippedHeight = 0L
+    val watermarkCache = mutableMapOf<WatermarkKey, Pair<Long, Long>>()
+    while (rockIndex < iterations) {
+        rockIndex++
+        val rockType = rockTypes[((rockIndex - 1) % rockTypes.size).toInt()]
+        val rock = Rock(2, rocks.height() + rockType.height + 3, rockType)
+        rocks.add(rock)
+
+        while (true) {
+            val jet = jets[jetIndex]
+            jetIndex = (jetIndex + 1) % jets.size
+            rock.tryPush(jet, rocks)
+            if (!rock.tryFall(rocks)) break
+        }
+
+        // Caching watermark
+        val height = rocks.height()
+        val watermark = rocks.watermark()
+        val key = WatermarkKey(rockType, jetIndex, watermark.normalize())
+
+        val last = watermarkCache[key]
+        if (last != null) {
+            val (lastRockIndex, lastHeight) = last
+            val cycleDuration = rockIndex - lastRockIndex
+            val cycleHeight = height - lastHeight
+            val remainingFullCycles = (iterations - rockIndex) / cycleDuration
+            println("Repetition found! rockIndex=#$rockIndex, height=$height, last=$last. Skipping to ${remainingFullCycles * cycleDuration}")
+            rockIndex += remainingFullCycles * cycleDuration // Wheeeee...
+            skippedHeight = remainingFullCycles * cycleHeight
+            watermarkCache.clear()
+        } else {
+            watermarkCache[key] = Pair(rockIndex, height)
+        }
+
+        // Note: the repetition is found so quickly that this optimization was not necessary
+        // // Pruning the rocks list to speed collision detection
+        // val minWatermark = heights.min()
+        // rocks.removeIf { it.y < minWatermark }
+    }
+
+    println("Height of tower: ${skippedHeight + rocks.height()}")
+}
+
+private fun List<Rock>.height() = this.maxOfOrNull { it.y } ?: 0L
+private fun List<Rock>.watermark(): LongArray {
+    val watermark = longArrayOf(0, 0, 0, 0, 0, 0, 0)
+    for (r in this) {
+        val t = r.type
+        for (i in 0 until t.height) {
+            for (j in 0 until t.width) {
+                if (!t.pattern[i][j]) continue
+                watermark[r.x + j] = max(watermark[r.x + j], r.y - i)
+            }
+        }
+    }
+    return watermark
+}
+
+private fun LongArray.normalize(): IntArray {
+    val minHeight = this.min()
+    return this.map { (it - minHeight).toInt() }.toIntArray()
+}
+
+private data class Rock(var x: Int, var y: Long, val type: RockType) {
+
+    fun tryPush(jet: Int, rocks: List<Rock>) {
+        val newX = x + jet
+        if (newX < 0) return // Would collide with left wall
+        else if (newX + type.width > 7) return // Would collide with right wall
+        else {
+            for (rock in rocks) {
+                if (rock != this && rock.overlaps(newX, y, type)) return // Would collide with another rock
+            }
+            x = newX // Jet pushed the rock successfully
+        }
+    }
+
+    fun tryFall(rocks: List<Rock>): Boolean {
+        val newY = y - 1
+        if (newY - type.height < 0) return false // Fell to the floor
+        for (rock in rocks) {
+            if (rock != this && rock.overlaps(x, newY, type)) return false // Fell on a rock
+        }
+        y = newY
+        return true
+    }
+
+    private fun overlaps(x: Int, y: Long, t: RockType): Boolean {
+        if (x + t.width < x // To the left
+            || x > this.x + type.width // To the right
+            || y - t.height > y // Above us
+            || y < this.y - type.height // Below us
+        ) return false // Bounding boxes don't overlap
+        for (i in 0 until t.height) {
+            for (j in 0 until t.width) {
+                if (!t.pattern[i][j]) continue // The pattern is empty here - can't collide
+                val ox = x + j
+                val oy = y - i
+                for (k in 0 until type.height) {
+                    for (l in 0 until type.width) {
+                        if (!type.pattern[k][l]) continue // The pattern is empty here - can't collide
+                        if (this.x + l == ox && this.y - k == oy) return true
+                    }
+                }
+            }
+        }
+        return false
+    }
+}
+
+private enum class RockType(val pattern: Array<BooleanArray>) {
+    HORIZONTAL(
+        intArrayOf(1, 1, 1, 1)
+    ),
+    CROSS(
+        intArrayOf(0, 1, 0),
+        intArrayOf(1, 1, 1),
+        intArrayOf(0, 1, 0),
+    ),
+    CORNER(
+        intArrayOf(0, 0, 1),
+        intArrayOf(0, 0, 1),
+        intArrayOf(1, 1, 1),
+    ),
+    VERTICAL(
+        intArrayOf(1),
+        intArrayOf(1),
+        intArrayOf(1),
+        intArrayOf(1),
+    ),
+    SPHERICAL(
+        intArrayOf(1, 1),
+        intArrayOf(1, 1),
+    );
+
+    val width = pattern[0].size
+    val height = pattern.size
+
+    constructor(vararg intPattern: IntArray) : this(intPattern.map { line -> line.map { it == 1 }.toBooleanArray() }.toTypedArray())
+}
+
+private data class WatermarkKey(val rockType: RockType, val nextJet: Int, val watermark: IntArray) {
+    override fun equals(other: Any?): Boolean {
+        other as WatermarkKey
+        return (rockType == other.rockType)
+                && (nextJet == other.nextJet)
+                && (watermark.contentEquals(other.watermark))
+    }
+
+    override fun hashCode(): Int {
+        var result = rockType.hashCode()
+        result = 31 * result + nextJet
+        result = 31 * result + watermark.contentHashCode()
+        return result
+    }
+}

src/main/resources/input17.txt

@@ -0,0 +1 @@
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