AdventOfCode/Day 03/Day03.cs

using System.Text;

namespace Day_03.Day_03
{
    internal class Day03
    {
        public static string InputPath = "Day 03/day-03-input.txt";

        internal static string GetPart1(byte[] data)
        {
            string[] rucksackData = Encoding.UTF8.GetString(data).Split(Environment.NewLine);
            int priorityCount = 0;

            // go throu each ruchsack
            foreach (string rucksack in rucksackData.Where(x => !string.IsNullOrWhiteSpace(x)))
            { 
                // split the data line down the middel
                string rucksackOne = rucksack.Substring(0, rucksack.Length / 2);
                string rucksackTwo = rucksack.Substring(rucksack.Length / 2, rucksack.Length / 2);
                char prioChar = rucksackOne.Where(x => rucksackTwo.Contains(x)).First();
                priorityCount += prioChar > 'Z' ? (prioChar  - 'a' + 1) : (prioChar - 'A' + 27);
            }

            return priorityCount.ToString();
        }

        internal static string GetPart2(byte[] data)
        {
            string[] rucksackData = Encoding.UTF8.GetString(data).Split(Environment.NewLine);
            int priorityCount = 0;

            for (int index = 0; index < rucksackData.Length; index += 3)
            {
                // get the 3 ruchsacks
                string[] ruchsacks = rucksackData.Skip(index).Take(3).ToArray();
                char prioChar = ruchsacks[0].Where(x => ruchsacks[1].Contains(x) && ruchsacks[2].Contains(x)).First();
                priorityCount += prioChar > 'Z' ? (prioChar - 'a' + 1) : (prioChar - 'A' + 27);
            }

            return priorityCount.ToString();
        }
    }
}