days/src/main/kotlin/Day24.kt

@@ -1,80 +0,0 @@
-package be.vandewalleh.aoc.days
-
-import be.vandewalleh.aoc.utils.input.Day
-import be.vandewalleh.aoc.utils.input.Input
-import be.vandewalleh.aoc.utils.input.Lines
-import be.vandewalleh.aoc.utils.input.createDay
-import org.eclipse.collections.api.bag.Bag
-import org.eclipse.collections.api.bag.MutableBag
-import org.eclipse.collections.api.factory.Bags
-
-@Day(24)
-class Day24(@Lines val input: Input<List<String>>) {
-
-    private enum class Direction(vararg coordinates: Int) {
-        E(1, -1, 0),
-        SE(0, -1, 1),
-        SW(-1, 0, 1),
-        W(-1, 1, 0),
-        NW(0, 1, -1),
-        NE(1, 0, -1);
-
-        val coordinates = coordinates
-    }
-
-    private fun parseTile(line: String) = "e|se|sw|w|nw|ne".toRegex()
-        .findAll(line)
-        .flatMap { it.groupValues }
-        .map { Direction.valueOf(it.toUpperCase()) }
-        .toList()
-
-    private val tiles = input.value.map { parseTile(it) }.map {
-        it.map { it.coordinates }
-            .reduce { acc, ints -> intArrayOf(acc[0] + ints[0], acc[1] + ints[1], acc[2] + ints[2]) }
-            .toList()
-    }
-
-    fun part1() = Bags.immutable.ofAll(tiles).selectBlacks().size()
-
-    private fun Bag<List<Int>>.selectBlacks() = selectByOccurrences { it % 2 == 1 }
-
-    private fun List<Int>.adjacents(): List<List<Int>> {
-        val (x, y, z) = this
-        return listOf(
-            listOf(x + 1, y - 1, z),
-            listOf(x, y - 1, z + 1),
-            listOf(x - 1, y, z + 1),
-            listOf(x - 1, y + 1, z),
-            listOf(x, y + 1, z - 1),
-            listOf(x + 1, y, z - 1),
-        )
-    }
-
-    // black -> odd
-    // white -> even || not in bag -> !in black
-    private fun day(bag: MutableBag<List<Int>>) {
-        val blacks = bag.selectBlacks().toSet()
-
-        val all = (bag + bag.flatMap { it.adjacents() }).toSet()
-
-        for (tile in all) {
-            val adjacents = tile.adjacents()
-            val adjacentBlacks = adjacents.count { it in blacks }
-            val isBlack = tile in blacks
-
-            if (isBlack && (adjacentBlacks == 0 || adjacentBlacks > 2)) bag.setOccurrences(tile, 2)
-            else if (!isBlack && adjacentBlacks == 2) bag.setOccurrences(tile, 1)
-        }
-    }
-
-    fun part2(): Int {
-        val bag = Bags.mutable.ofAll(tiles)
-        repeat(100) { day(bag) }
-        return bag.selectBlacks().size()
-    }
-}
-
-fun main() = with(createDay<Day24>()) {
-    println(part1())
-    println(part2())
-}

days/src/main/resources/day24.txt

@@ -1,419 +0,0 @@
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