Use custom class for faster hashcode

days/src/main/kotlin/Day24.kt

@@ -12,7 +12,7 @@ import org.eclipse.collections.api.factory.Bags
 class Day24(@Lines val input: Input<List<String>>) {
 
     private data class HexPoint(val x: Int, val y: Int, val z: Int) {
-        fun translate(x: Int, y: Int, z: Int) = HexPoint(this.x + x, this.y + y, this.z + z)
+        fun translate(other: HexPoint) = HexPoint(this.x + other.x, this.y + other.y, this.z + other.z)
     }
 
     private enum class Direction(vararg coordinates: Int) {
@@ -23,7 +23,7 @@ class Day24(@Lines val input: Input<List<String>>) {
         NW(0, 1, -1),
         NE(1, 0, -1);
 
-        val coordinates = coordinates
+        val coordinates = HexPoint(coordinates[0], coordinates[1], coordinates[2])
     }
 
     private fun parseTile(line: String) = "e|se|sw|w|nw|ne".toRegex()
@@ -33,23 +33,14 @@ class Day24(@Lines val input: Input<List<String>>) {
         .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]) }
-            .let { (x, y, z) -> HexPoint(x, y, z) }
+        it.map { it.coordinates }.reduce { acc, ints -> acc.translate(ints) }
     }
 
     fun part1() = Bags.immutable.ofAll(tiles).selectBlacks().size()
 
     private fun Bag<HexPoint>.selectBlacks() = selectByOccurrences { it % 2 == 1 }
 
-    private fun HexPoint.adjacents() = listOf(
-        translate(1, -1, 0),
-        translate(0, -1, 1),
-        translate(-1, 0, 1),
-        translate(-1, 1, 0),
-        translate(0, 1, -1),
-        translate(1, 0, -1)
-    )
+    private fun HexPoint.adjacents() = Direction.values().map { this.translate(it.coordinates) }
 
     // black -> odd
     // white -> even || not in bag -> !in black