Day 2 Advent of Code 2020

aoc2020-02.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using AdventOfCode.Library;

namespace AdventOfCode
{
    internal static class Program
    {
        private const bool DoPart1 = true;
        private const bool DoPart2 = true;

        // Day 02
        public static void Main()
        {
            //    Process your data here
            var data = TextUtility.ReadWords(separators: new[] {' ', '-', ':', '\n', '\r'}, removeBlank: true);
            var finalData = data.ToList();

            //    Get ready to track everything
            var watch1 = new Stopwatch();
            var watch2 = new Stopwatch();
            var answer1 = "";
            var answer2 = "";

            //    Solve problems.
            if (DoPart1)
            {
                watch1.Start();
                answer1 = Part1(finalData);
                watch1.Stop();
            }

            if (DoPart2)
            {
                watch2.Start();
                answer2 = Part2(finalData);
                watch2.Stop();
            }

            //    Do output
            if (!string.IsNullOrEmpty(answer1) || !string.IsNullOrEmpty(answer2))
            {
                Console.WriteLine("Results");
                if (DoPart1)
                {
                    Console.WriteLine($"PART 1 ANSWER:\t{answer1}\n{watch1.ElapsedMilliseconds} ms");
                }

                if (DoPart2)
                {
                    Console.WriteLine($"PART 2 ANSWER:\t{answer2}\n{watch2.ElapsedMilliseconds} ms");
                }
            }
            else
            {
                Console.WriteLine("No results have been activated.");
            }
        }

        private static string Part1(IEnumerable<string> data)
        {
            var parts = data.ToList();
            var total = 0;
            
            for (var k = 0; k < parts.Count; k += 4)
            {
                int count1 = int.Parse(parts[k]);
                int count2 = int.Parse(parts[k + 1]);
                char rule = parts[k + 2][0];
                string pass = parts[k + 3];

                int countLetters = pass.Count(x => x == rule);

                if (countLetters >= count1 && countLetters <= count2)
                {
                    total++;
                }
            }

            return total.ToString();
        }

        private static string Part2(IEnumerable<string> data)
        {
            var parts = data.ToList();
            var total = 0;
            for (var k = 0; k < parts.Count; k += 4)
            {
                int count1 = int.Parse(parts[k]);
                int count2 = int.Parse(parts[k + 1]);
                char rule = parts[k + 2][0];
                string pass = parts[k + 3];

                if (pass[count1-1] == rule ^ pass[count2-1] == rule)
                {
                    total++;
                }
            }

            return total.ToString();
        }
    }
}