89 lines
2.8 KiB
Kotlin
89 lines
2.8 KiB
Kotlin
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import java.io.File
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typealias Round = List<Pull>
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typealias Pull = Pair<Color, Int>
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enum class Color {
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RED,
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GREEN,
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BLUE
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}
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fun main() {
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val input = File("input")
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val games = input.useLines { it.map { Game.fromLine(it) }.toList() }
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println(games.filter { it.isValid() }.map { it.id }.sum())
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println(
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games
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.map {
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val min = it.minimumCubes()
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min.first.second * min.second.second * min.third.second
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}
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.sum()
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)
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}
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data class Game(val id: Int, val rounds: List<Round>) {
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fun isValid(): Boolean {
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return this.rounds.all {
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it.all {
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when (it.first) {
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Color.RED -> it.second <= 12
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Color.GREEN -> it.second <= 13
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Color.BLUE -> it.second <= 14
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}
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}
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}
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}
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fun minimumCubes(): Triple<Pull, Pull, Pull> {
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return this.rounds.fold(
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Triple(Pair(Color.RED, 0), Pair(Color.GREEN, 0), Pair(Color.BLUE, 0))
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) { acc, next ->
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next.fold(acc) { mins, pull ->
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when {
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pull.first == Color.RED && mins.first.second < pull.second ->
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Triple(pull, mins.second, mins.third)
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pull.first == Color.GREEN && mins.second.second < pull.second ->
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Triple(mins.first, pull, mins.third)
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pull.first == Color.BLUE && mins.third.second < pull.second ->
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Triple(mins.first, mins.second, pull)
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else -> mins
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}
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}
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}
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}
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companion object {
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fun fromLine(line: String): Game {
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val (name, game) = line.split(": ")
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val id = name.split(" ")[1].toInt()
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val rounds =
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game.split("; ").map {
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it.split(", ").map {
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val pull = it.split(" ")
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val color =
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when (pull.last()) {
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"red" -> Color.RED
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"green" -> Color.GREEN
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"blue" -> Color.BLUE
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else ->
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throw Exception(
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"Invalid ball color: ${pull.last()}"
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)
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}
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val number = pull.first().toInt()
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Pair(color, number)
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}
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}
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return Game(id, rounds)
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}
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}
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}
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