namespace AOC2022;
///
/// Day 3:
///
public sealed class Day03() : Day(2022, 3, "Rucksack Reorganization")
{
public override object Part1() =>
Input.Sum(rucksack => RankItem(rucksack.Chunk(rucksack.Length / 2).Aggregate>((a, b) => a.Intersect(b)).Single()));
public override object Part2() =>
Input.Chunk(3).Sum(group => RankItem(group.Aggregate>((a, b) => a.Intersect(b)).Single()));
private static int RankItem(char item) => item - (char.IsUpper(item) ? '&' : '`');
}