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75
src/main/kotlin/adventofcode/year2024/Day14RestroomRedoubt.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package adventofcode.year2024 | ||
|
|
||
| import adventofcode.Puzzle | ||
| import adventofcode.PuzzleInput | ||
| import adventofcode.common.product | ||
| import adventofcode.common.spatial.Point2d | ||
|
|
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| class Day14RestroomRedoubt(customInput: PuzzleInput? = null) : Puzzle(customInput) { | ||
| private val robots by lazy { input.lines().map(Robot::invoke) } | ||
|
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| override fun partOne(): Int { | ||
| val robotCount = | ||
| generateSequence(robots) { previous -> previous.map(Robot::move) } | ||
| .drop(1) | ||
| .take(SECONDS) | ||
| .last() | ||
| .groupingBy(Robot::position) | ||
| .eachCount() | ||
|
|
||
| val leftHalf = 0 until BATHROOM_WIDTH / 2 | ||
| val rightHalf = BATHROOM_WIDTH / 2 + 1 until BATHROOM_WIDTH | ||
| val topHalf = 0 until BATHROOM_HEIGHT / 2 | ||
| val bottomHalf = BATHROOM_HEIGHT / 2 + 1 until BATHROOM_HEIGHT | ||
|
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| return setOf( | ||
| leftHalf to topHalf, | ||
| rightHalf to topHalf, | ||
| leftHalf to bottomHalf, | ||
| rightHalf to bottomHalf, | ||
| ) | ||
| .map { (qx, qy) -> robotCount.filterKeys { point -> point.x in qx && point.y in qy }.values.sum() } | ||
| .product() | ||
| } | ||
|
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| companion object { | ||
| private val ROBOT_REGEX = """p=(\d+),(\d+) v=(-?\d+),(-?\d+)""".toRegex() | ||
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| private const val SECONDS = 100 | ||
| private const val BATHROOM_WIDTH = 101 | ||
| private const val BATHROOM_HEIGHT = 103 | ||
|
|
||
| private data class Robot( | ||
| val position: Point2d, | ||
| val velocity: Point2d, | ||
| ) { | ||
| fun move(): Robot { | ||
| val dx = position.x + velocity.x | ||
| val dy = position.y + velocity.y | ||
|
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| val x = | ||
| when { | ||
| dx < 0 -> BATHROOM_WIDTH + dx | ||
| dx >= BATHROOM_WIDTH -> dx - BATHROOM_WIDTH | ||
| else -> dx | ||
| } | ||
|
|
||
| val y = | ||
| when { | ||
| dy < 0 -> BATHROOM_HEIGHT + dy | ||
| dy >= BATHROOM_HEIGHT -> dy - BATHROOM_HEIGHT | ||
| else -> dy | ||
| } | ||
|
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| return Robot(Point2d(x, y), velocity) | ||
| } | ||
|
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| companion object { | ||
| operator fun invoke(input: String): Robot { | ||
| val (px, py, vx, vy) = ROBOT_REGEX.find(input)!!.destructured | ||
| return Robot(Point2d(px.toInt(), py.toInt()), Point2d(vx.toInt(), vy.toInt())) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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