Day 7: Camel Cards

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  • mykl@lemmy.world
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    1 year ago

    Dart

    I’m glad I took the time to read the directions very carefully before starting coding :-)

    Top Tip: my ranking of hand types relies on the fact that if you count instances of each face and sort the resulting list from high to low, you get a list that when compared with lists from other hands gives an exact correspondence with the order of the hand types as defined, so no need for a bunch of if/thens, just

      var type = Multiset.from(hand).counts.sorted(descending).join('');
    

    Otherwise it should all be pretty self-explanatory apart from where I chose to map card rank to hex digits in order to facilitate sorting, so ‘b’ means ‘J’!

    int descending(T a, T b) => b.compareTo(a);
    var cToH = "  23456789TJQKA"; // used to map card rank to hex for sorting.
    
    handType(List hand, {wildcard = false}) {
      var type = Multiset.from(hand).counts.sorted(descending).join('');
      var i = hand.indexOf('b');
      return (!wildcard || i == -1)
          ? type
          : '23456789acde'
              .split('')
              .map((e) => handType(hand.toList()..[i] = e, wildcard: true))
              .fold(type, (s, t) => s.compareTo(t) >= 0 ? s : t);
    }
    
    solve(List lines, {wildcard = false}) => lines
        .map((e) {
          var l = e.split(' ');
          var hand =
              l.first.split('').map((e) => cToH.indexOf(e).toRadixString(16));
          var type = handType(hand.toList(), wildcard: wildcard);
          if (wildcard) hand = hand.map((e) => e == 'b' ? '0' : e);
          return (hand.join(), type, int.parse(l.last));
        })
        .sorted((a, b) {
          var c = a.$2.compareTo(b.$2);
          return (c == 0) ? a.$1.compareTo(b.$1) : c;
        })
        .indexed(offset: 1)
        .map((e) => e.value.$3 * e.index)
        .sum;
    
    part1(List lines) => solve(lines);
    
    part2(List lines) => solve(lines, wildcard: true);