39 lines
948 B
C#
39 lines
948 B
C#
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using var sr = new StreamReader("../input/day7.txt");
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var lines = sr.ReadToEnd().Split("\n").Select(x => x.Trim()).ToList();
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var numbers = lines.First().Split(",").Select(double.Parse).ToList();
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var acc = 0.0;
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var median = GetMedian(numbers.ToArray());
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foreach (var num in numbers)
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acc += Math.Abs(num - median);
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Console.WriteLine(acc);
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acc = 0.0;
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var avg = Math.Floor(numbers.Average());
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foreach (var num in numbers)
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{
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var n = Math.Abs(num - avg);
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acc += n * (n + 1) / 2; // Gauss formula, one of the very very few math tricks i know
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}
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Console.WriteLine(acc);
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double GetMedian(double[] nums)
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{
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var ret = 0.0;
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Array.Sort(nums);
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if (nums.Length % 2 == 0)
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{
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var firstValue = nums[(nums.Length / 2) - 1];
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var secondValue = nums[(nums.Length / 2)];
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ret = (firstValue + secondValue) / 2.0;
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}
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if (nums.Length % 2 == 1)
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{
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ret = nums[(nums.Length / 2)];
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}
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return ret;
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}
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