/
Day19.scala
56 lines (44 loc) · 2.65 KB
/
Day19.scala
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package AdventOfCode2022
object Day19:
case class Resources(ore: Int, clay: Int, obsidian: Int, geode: Int):
def +(r: Resources): Resources = Resources(ore + r.ore, clay + r.clay, obsidian + r.obsidian, geode + r.geode)
def -(r: Resources): Resources = Resources(ore - r.ore, clay - r.clay, obsidian - r.obsidian, geode - r.geode)
def <=(r: Resources): Boolean = ore <= r.ore && clay <= r.clay && obsidian <= r.obsidian && geode <= r.geode
def maximize(input: Seq[String], minutes: Int): Seq[Int] = input.map { line =>
val Seq(id, ore1, ore2, ore3, clay, ore4, obsidian) = line.split("\\D+").tail.map(_.toInt).toSeq
val oreBotCost = Resources(ore1, 0, 0, 0)
val clayBotCost = Resources(ore2, 0, 0, 0)
val obsidianBotCost = Resources(ore3, clay, 0, 0)
val geodeBotCost = Resources(ore4, 0, obsidian, 0)
val zero = Resources(0, 0, 0, 0)
val oreBot = Resources(1, 0, 0, 0)
val clayBot = Resources(0, 1, 0, 0)
val obsidianBot = Resources(0, 0, 1, 0)
val geodeBot = Resources(0, 0, 0, 1)
val maxOre = ore1.max(ore2).max(ore3).max(ore4)
val maxClay = clay
val maxObsidian = obsidian
def helper(time: Int, bots: Resources, resources: Resources, prevCanOre: Boolean, prevCanClay: Boolean, prevCanObsidian: Boolean): Int =
if time == 0 then
resources.geode
else if geodeBotCost <= resources then
helper(time - 1, bots + geodeBot, resources + bots - geodeBotCost, false, false, false)
else
val canOre = oreBotCost <= resources && bots.ore < maxOre
val canClay = clayBotCost <= resources && bots.clay < maxClay
val canObsidian = obsidianBotCost <= resources && bots.obsidian < maxObsidian
val first = helper(time - 1, bots, resources + bots, canOre, canClay, canObsidian)
val second = if canOre && !prevCanOre then helper(time - 1, bots + oreBot, resources + bots - oreBotCost, false, false, false) else 0
val third = if canClay && !prevCanClay then helper(time - 1, bots + clayBot, resources + bots - clayBotCost, false, false, false) else 0
val fourth = if canObsidian && !prevCanObsidian then helper(time - 1, bots + obsidianBot, resources + bots - obsidianBotCost, false, false, false) else 0
first.max(second).max(third).max(fourth)
end if
end helper
id * helper(minutes, oreBot, zero, false, false, false)
}
def part1(input: Seq[String]): Int = maximize(input, 24).sum
def part2(input: Seq[String]): Int = maximize(input.take(3), 32).product / 6
def main(args: Array[String]): Unit =
val data = io.Source.fromResource("AdventOfCode2022/Day19.txt").getLines().toSeq
println(part1(data))
println(part2(data))