41 lines
1.2 KiB
C#
41 lines
1.2 KiB
C#
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var lines = File.ReadAllLines("input.txt");
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var reports = lines.Select(line => line.Split(" ").ToList()).ToList();
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int safeReportsNumber = 0, problemDampenerSafeReports = 0;
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for (int i = 0; i < reports.Count; i++)
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{
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var currentReport = reports[i].Select(x => int.Parse(x)).ToList();
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if (IsReportSafe(currentReport)) safeReportsNumber++;
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if (IsReportSafeWithDampener(currentReport)) problemDampenerSafeReports++;
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}
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Console.WriteLine($"Part1: {safeReportsNumber}\nPart2: {problemDampenerSafeReports}");
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bool IsReportSafe(List<int> levels)
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{
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var isAscending = levels.SequenceEqual(levels.OrderBy(x => x));
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var isDescending = levels.SequenceEqual(levels.OrderByDescending(x => x));
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var allValidDifferennce = levels.Zip(levels.Skip(1), (a, b) => Math.Abs(a - b) > 0 && Math.Abs(a - b) < 4).All(x => x);
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return (isAscending || isDescending) && allValidDifferennce;
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}
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bool IsReportSafeWithDampener(List<int> levels)
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{
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if (IsReportSafe(levels)) return true;
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// Performance killa..
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for (int i = 0; i < levels.Count; i++)
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{
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var modifiedLevels = new List<int>(levels);
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modifiedLevels.RemoveAt(i);
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if (IsReportSafe(modifiedLevels)) return true;
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}
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return false;
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}
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