Day 6 Advent of Code - 2020

aoc2020-06.cs

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

namespace AdventOfCode
{
    // Day 6
    internal static class Program
    {
        private const bool DoPart1 = true;
        private const bool DoPart2 = true;
        
        public static void Main()
        {
	        var data = TextUtility.ReadBlobs();
	        var customs = data.Select(cf => new CustomsForm(cf)).ToList();
	        data.Process(DoPart1, 1, customs, Solver1);
	        data.Process(DoPart2, 1, customs, Solver2);
        }

        private static string Solver1(List<string> arg1, object arg2)
        {
	        var customs = (List<CustomsForm>) arg2;
	        int answer = customs.Select(c => c.DistinctQuestions).Sum();
	        return $"{answer}";
        }

        private static string Solver2(List<string> arg1, object arg2)
        {
	        var customs = (List<CustomsForm>) arg2;
	        int answer = customs.Select(c => c.AllMatchedQuestions).Sum();
	        return $"{answer}";
        }
    }
}

CustomsForm.cs

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

namespace AdventOfCode
{
    [DebuggerDisplay("People: {People} - Distinct: {DistinctQuestions} - AllMatch: {AllMatchedQuestions}")]
    public class CustomsForm
    {
        public readonly int People;
        private readonly Dictionary<char, int> _tally;
        public int DistinctQuestions => _tally.Keys.Count;
        public int AllMatchedQuestions => _tally.Values.Count(c => c == People);

        public CustomsForm(string s)
        {
            var answers = s.Split(" ", StringSplitOptions.RemoveEmptyEntries);
            People = answers.Length;

            _tally = new Dictionary<char, int>();
            foreach (string answer in answers)
            {
                foreach (char c in answer)
                {
                    if (!_tally.ContainsKey(c))
                    {
                        _tally[c] = 0;
                    }

                    _tally[c]++;
                }
            }
        }
    }
}