Day3.cs

using System.Text.RegularExpressions;
using AoC2024.Extensions;

namespace AoC2024.Days
{
    internal partial class Day3
    {
        public static string input
        {
            get;
            set;
        }

        private static List<(int,int)> Muls = [];

        private static List<(int,int)> Dos = [];

        private static void Parse()
        {
            var reg = MyRegex().Matches(input);
            var doIt = true;
            foreach(Match r in reg)
            {
                if (r.Groups[1].Success)
                {
                    doIt = true;
                }
                else if (r.Groups[2].Success) doIt = false;
                if(r.Groups[3].Success)
                {
                    var (num1, num2) = r.Value.ExtractNumbers<int>() switch { var a => (a[0], a[1]) };
                    Muls.Add((num1, num2));
                    if(doIt) Dos.Add((num1, num2));
                }
            }
        }
        public static int PartOne()
        {
            Parse();
            return Muls.Sum(p => p.Item1 * p.Item2);
        }
        public static int PartTwo() => Dos.Sum(p => p.Item1 * p.Item2);
        [GeneratedRegex(@"(do\(\))|(don't\(\))|(mul\(\d+,\d+\))")]
        private static partial Regex MyRegex();
    }
}