46 lines
1.1 KiB
Scala
46 lines
1.1 KiB
Scala
package aoc.day2
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import aoc._
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case class Hand(red: Int, green: Int, blue: Int):
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def max(other: Hand) =
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Hand(red max other.red, green max other.green, blue max other.blue)
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def power = red * green * blue
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case class Game(id: Int, hands: List[Hand]):
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def power =
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hands.foldLeft(Hand(0, 0, 0))(_ max _).power
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object Parser extends CommonParser:
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val update =
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num.into: num =>
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"red" ^^^ ((h: Hand) => h.copy(red = num)) |
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"green" ^^^ ((h: Hand) => h.copy(green = num)) |
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"blue" ^^^ ((h: Hand) => h.copy(blue = num))
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val hand = rep1sep(update, ",").map(_.foldRight(Hand(0, 0, 0))(_(_)))
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val game = "Game" ~ num ~ ":" ~ repsep(hand, ";") ^^ { case (_ ~ num ~ _ ~ hands) =>
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Game(num, hands)
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}
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end Parser
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// Part 1
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def getGames = lines.map(Parser.parse(Parser.game, _).get)
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def part1 =
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val games = getGames.toList
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val res =
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games
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.filter(g => g.hands.forall(h => h.red <= 12 && h.green <= 13 && h.blue <= 14))
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.map(_.id)
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.sum
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println(res)
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def part2 =
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val res = getGames.map(_.power).sum
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println(res)
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@main def Day2(part: Int) = part match
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case 1 => part1
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case 2 => part2
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