63 lines
1.8 KiB
C#
63 lines
1.8 KiB
C#
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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 Day02 {
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static bool IsPasswordValid1(string spec) {
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string[] tokens = spec.Split(' ');
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string[] numbers = tokens[0].Split('-');
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int min = int.Parse(numbers[0]);
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int max = int.Parse(numbers[1]);
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char required = tokens[1][0];
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string password = tokens[2];
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int count = 0;
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for (int i = 0; i < password.Length; i++) {
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if (password[i] == required) {
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count++;
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}
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}
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return min <= count && count <= max;
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}
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static bool IsPasswordValid2(string spec) {
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string[] tokens = spec.Split(' ');
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string[] numbers = tokens[0].Split('-');
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int lowIndex = int.Parse(numbers[0]) - 1;
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int highIndex = int.Parse(numbers[1]) - 1;
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char required = tokens[1][0];
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string password = tokens[2];
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return
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(password[lowIndex] == required && password[highIndex] != required) ||
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(password[lowIndex] != required && password[highIndex] == required);
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}
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static int Part1() {
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return File.ReadAllLines(Util.RootDir + "day02.txt").Count(IsPasswordValid1);
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}
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static int Part2() {
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return File.ReadAllLines(Util.RootDir + "day02.txt").Count(IsPasswordValid2);
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}
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[Fact]
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public static void Test() {
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Assert.True(IsPasswordValid1("1-3 a: abcde"));
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Assert.False(IsPasswordValid1("1-3 b: cdefg"));
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Assert.True(IsPasswordValid1("2-9 c: ccccccccc"));
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Assert.Equal(603, Part1());
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Assert.True(IsPasswordValid2("1-3 a: abcde"));
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Assert.False(IsPasswordValid2("1-3 b: cdefg"));
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Assert.False(IsPasswordValid2("2-9 c: ccccccccc"));
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Assert.Equal(404, Part2());
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}
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}
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}
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