Day 7: Camel Cards

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  • cvttsd2si@programming.dev
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    7 months ago

    Scala3

    val tiers = List(List(1, 1, 1, 1, 1), List(1, 1, 1, 2), List(1, 2, 2), List(1, 1, 3), List(2, 3), List(1, 4), List(5))
    val cards = List('2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K', 'A')
    
    def cardValue(base: Long, a: List[Char], cards: List[Char]): Long =
        a.foldLeft(base)(cards.size * _ + cards.indexOf(_))
    
    def hand(a: List[Char]): List[Int] =
        a.groupMapReduce(s => s)(_ => 1)(_ + _).values.toList.sorted
    
    def power(a: List[Char]): Long =
      cardValue(tiers.indexOf(hand(a)), a, cards)
    
    def power3(a: List[Char]): Long = 
      val x = hand(a.filter(_ != 'J'))
      val t = tiers.lastIndexWhere(x.zipAll(_, 0, 0).forall(_ <= _))
      cardValue(t, a, 'J'::cards)
    
    def win(a: List[String], pow: List[Char] => Long) =
        a.flatMap{case s"$hand $bid" => Some((pow(hand.toList), bid.toLong)); case _ => None}
            .sorted.map(_._2).zipWithIndex.map(_ * _.+(1)).sum
    
    def task1(a: List[String]): Long = win(a, power)
    def task2(a: List[String]): Long = win(a, power3)