AdventOfCode2023/AdventOfCode2023/Day2/Day2_2.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace AdventOfCode2023.Day2
{
    public class Day2_2 : DayBase
    {
        string input = string.Empty;

        Regex gameIdRegex = new Regex(@"Game (?<ID>\d+):");

        public Day2_2()
        {
            input = GetInput("Day2.txt");
        }

        public Day2_2(string testInput)
        {
            input = testInput;
        }

        public override string Execute()
        {
            var inputLines = input.Split("\r\n");
            List<Game> games = inputLines.Select(LineToGame).ToList();

            foreach (var game in games)
            {
                var maxima = game.GetMaxima();
                game.Power = maxima.red * maxima.green * maxima.blue;
            }

            return games.Select(x => x.Power).Sum().ToString();
        }

        private Game LineToGame(string line)
        {
            if(!gameIdRegex.IsMatch(line))
            {
                throw new Exception($"Line: {line} does not contain game id!");
            }

            string gameId = gameIdRegex.Match(line).Groups["ID"].Value;
            string setLine = gameIdRegex.Replace(line, "");
            List<string> set = setLine.Split(';').ToList();

            return new Game(gameId, set);
        }
    }
}