2017-12-02_15-36-35.cs

int Answer1(string input) => Parse(input).Sum(r => r.Max() - r.Min());

int Answer2(string input) => Parse(input).Sum(r =>
		r.CartesianProduct()
		.Where(t => t.a != t.b && t.a % t.b == 0)
		.Select(t => t.a / t.b)
		.Single());

IEnumerable<IEnumerable<int>> Parse(string input) => 
	input.Split("\r\n")
		.Select(x => 
			x.Split("\t")
				.Select(int.Parse));

static class ext
{
	public static IEnumerable<(T a, T b)> CartesianProduct<T>(this IEnumerable<T> ts)
	{
		var tsa = ts.ToArray();
		foreach(var a in tsa)
			foreach(var b in tsa)
				yield return (a, b);
	}
	
	public static string[] Split(this string str, string delimiter, StringSplitOptions options = StringSplitOptions.None) =>
		str.Split(new[]{delimiter}, options);
}