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7438fc97a9
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aedc195562
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using System;
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using static System.Console;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using Xunit;
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namespace AdventOfCode {
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public class Day06 {
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static int CountAnswers1(string[] input) {
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int total = 0;
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var groupAnswers = new HashSet<char>();
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foreach (string line in input) {
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if (line == "") {
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total += groupAnswers.Count();
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groupAnswers.Clear();
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continue;
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}
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foreach (char c in line) {
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groupAnswers.Add(c);
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}
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}
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total += groupAnswers.Count();
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return total;
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}
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static int CountAnswers2(string[] input) {
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int total = 0;
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var groupAnswers = new HashSet<char>();
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int groupSize = 0;
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foreach (string line in input) {
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if (line == "") {
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total += groupAnswers.Count();
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groupAnswers.Clear();
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groupSize = 0;
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continue;
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}
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groupSize++;
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if (groupSize == 1) {
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foreach (char c in line) {
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groupAnswers.Add(c);
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}
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} else {
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foreach (char c in groupAnswers) {
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if (!line.Contains(c)) {
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groupAnswers.Remove(c);
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}
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}
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}
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}
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total += groupAnswers.Count();
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return total;
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}
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static int Part1() {
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string[] input = File.ReadAllLines(Util.RootDir + "day06.txt");
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return CountAnswers1(input);
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}
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static int Part2() {
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string[] input = File.ReadAllLines(Util.RootDir + "day06.txt");
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return CountAnswers2(input);
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}
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[Fact]
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public static void Test() {
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string[] example =
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@"abc
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a
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b
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c
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ab
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ac
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a
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a
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a
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a
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b".Split('\n');
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Assert.Equal(11, CountAnswers1(example));
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Assert.Equal(6, CountAnswers2(example));
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Assert.Equal(6947, Part1());
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Assert.Equal(3398, Part2());
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}
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}
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}
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@ -19,7 +19,7 @@ namespace AdventOfCode {
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public class Program {
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static void Main(string[] args) {
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Day06.Test();
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Day05.Test();
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}
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}
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}
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2239
2020/day06.txt
2239
2020/day06.txt
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