AdventOfCode/AdventOfCode.Solutions/2023/Day 02/Day02Part1.cs

using System.Text.RegularExpressions;

namespace AdventOfCode.Solutions._2023
{
    public class Day02Part1 : Answerable
    {
        public override int Year { get; set; } = 2023;
        public override int Day { get; set; } = 2;
        public override int Part { get; set; } = 1;

        public override string GetAnswer(byte[] data)
        {
            return GetAsStringArray(data)
                .Select(ParseGames)
                .Sum()
                .ToString();
        }

        private int ParseGames(string line)
        {
            // get all the numers
            string gameId = line.Split(':')[0].Split(' ')[1];
            string[] dicePulls = line.Split(':')[1].Split(';');

            // parse the pulls
            foreach (string dicePull in dicePulls)
            {
                // regex the pull
                MatchCollection dice = Regex.Matches(dicePull, "(\\d+) (g|r|b)");
                foreach (Match match in dice)
                {
                    string[] splitted = match.Value.Split(' ');
                    int ammount = int.Parse(splitted[0]);

                    if (ammount <= 12) // pass for all dice
                        continue;

                    if (ammount > 14 // fail for any dice set
                        || (splitted[1] == "r" && ammount > 12)
                        || (splitted[1] == "g" && ammount > 13))
                        return 0; // not possible
                }

            }

            return int.Parse(gameId);
        }
    }
}