Advent of Code 2017 Day 2

CorruptionChecksum.cs

int CorruptionChecksumPartOne(int[][] input)
{
	return input.Sum(r => 
	{
		(var max, var min) = r.Aggregate((max: int.MinValue, min: int.MaxValue), (acc, i) => (i > acc.max ? i : acc.max, i < acc.min ? i : acc.min));
		return max - min;
	});
}

int CorruptionChecksumPartTwo(int[][] input)
{
	return input.Sum(r =>
	{
		(var hi, var lo) = r.Pairs().First(i => (i.hi % i.lo) == 0);
		return hi / lo;
	});
}

public static class Extensions
{
	public static IEnumerable<(int hi, int lo)> Pairs(this int[] array)
	{
		foreach (var i in array)
		{
			foreach (var j in array)
			{
				if (i > j) yield return (i, j);
			}
		}
	}
}