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@ -0,0 +1,76 @@ |
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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 System.Text.RegularExpressions; |
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using Xunit; |
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namespace AdventOfCode { |
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public class Day09 { |
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static bool Valid(List<long> ints, int preambleSize, int target) { |
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for (int i = target - preambleSize; i < target - 1; i++) { |
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for (int j = i + 1; j < target; j++) { |
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if (i == j) { |
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continue; |
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} |
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if (ints[i] + ints[j] == ints[target]) { |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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static long FindInvalid(List<long> ints, int preambleSize) { |
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for (int target = preambleSize; target < ints.Count(); target++) { |
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if (!Valid(ints, preambleSize, target)) { |
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return ints[target]; |
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} |
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} |
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throw new Exception("didn't find an invalid int"); |
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} |
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static long Part1() { |
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string[] input = File.ReadAllLines(Util.RootDir + "day09.txt"); |
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List<long> ints = input.ToList().Select(long.Parse).ToList(); |
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return FindInvalid(ints, 25); |
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} |
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static int Part2() { |
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return -1; |
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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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@"35
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20 |
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15 |
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25 |
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47 |
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40 |
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62 |
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55 |
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65 |
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95 |
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102 |
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117 |
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150 |
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182 |
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127 |
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219 |
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299 |
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277 |
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309 |
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576".Split('\n');
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List<long> ints = example.ToList().Select(long.Parse).ToList(); |
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Assert.Equal(127, FindInvalid(ints, 5)); |
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Assert.Equal(50047984, Part1()); |
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Assert.Equal(-1, Part2()); |
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} |
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} |
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} |