AOC2022 day02

main.dart

/// Play Rock Paper Scissors
/// 1) By playing the given move.
/// 2) By playing for the desired result.
/// https://dartpad.dev/?id=96a60324a73eb1dc73d0d9378af0068c
import 'package:collection/collection.dart';

var scores = {
  'AX': 1 + 3,
  'AY': 2 + 6,
  'AZ': 3 + 0,
  'BX': 1 + 0,
  'BY': 2 + 3,
  'BZ': 3 + 6,
  'CX': 1 + 6,
  'CY': 2 + 0,
  'CZ': 3 + 3,
};
var strategy = {
  'Z': ['AY', 'BZ', 'CX'],
  'X': ['AZ', 'BX', 'CY'],
  'Y': ['AX', 'BY', 'CZ']
};

int part1(List<String> lines) =>
    lines.map((e) => scores[e.split(' ').join('')]!).toList().sum;

int part2(List<String> lines) => lines
    .map((e) => e.split(' '))
    .map((l) =>
        scores[strategy[l.last]!.firstWhere((e) => e.startsWith(l.first))]!)
    .sum;

var testdata = """A Y
B X
C Z""".split('\n');

void main(List<String> args) {
  assert(part1(testdata) == 15);
  assert(part2(testdata) == 12);
  print('tests succeeded');
}