65 lines
1.9 KiB
C#
65 lines
1.9 KiB
C#
using System.Text.RegularExpressions;
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var memory = File.ReadAllText("input.txt");
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var result = ParseCorruptedMemory(memory);
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var resultPart2 = ParseCorruptedMemoryPart2(memory);
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Console.WriteLine($"Part1: {result}\nPart2: {resultPart2}");
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int ParseCorruptedMemory(string corruptedMemory)
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{
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var mulPattern = @"mul\s*\(\s*(\d+)\s*,\s*(\d+)\s*\)";
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var matches = Regex.Matches(corruptedMemory, mulPattern);
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var totalSum = matches
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.Select(match =>
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{
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var x = int.Parse(match.Groups[1].Value);
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var y = int.Parse(match.Groups[2].Value);
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return x * y;
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}).Sum();
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return totalSum;
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}
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int ParseCorruptedMemoryPart2(string corruptedMemory)
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{
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var mulPattern = @"mul\s*\(\s*(\d+)\s*,\s*(\d+)\s*\)";
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var doPattern = @"do\s*\(\s*\)";
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var dontPattern = @"don't\s*\(\s*\)";
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var mulEnabled = true;
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var mulMatches = Regex.Matches(corruptedMemory, mulPattern);
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var doMatches = Regex.Matches(corruptedMemory, doPattern);
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var dontMatches = Regex.Matches(corruptedMemory, dontPattern);
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var allMatches = mulMatches
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.Concat(doMatches.Cast<Match>())
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.Concat(dontMatches.Cast<Match>())
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.OrderBy(m => m.Index)
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.ToList();
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var results = new List<int>();
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foreach (var match in allMatches)
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{
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if (Regex.IsMatch(match.Value, doPattern))
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{
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mulEnabled = true;
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}
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else if (Regex.IsMatch(match.Value, dontPattern))
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{
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mulEnabled = false;
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}
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else if (Regex.IsMatch(match.Value, mulPattern) && mulEnabled)
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{
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var mulMatch = (Match)match;
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var x = int.Parse(mulMatch.Groups[1].Value);
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var y = int.Parse(mulMatch.Groups[2].Value);
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results.Add(x * y);
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}
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}
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return results.Sum();
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} |