var lines = File.ReadAllLines("input.txt");

var parts = lines.Select(line => (line.Split("   ")[0], line.Split("   ")[1])).ToList();
var list1 = parts.Select(part => int.Parse(part.Item1)).Order().ToList();
var list2 = parts.Select(part => int.Parse(part.Item2)).Order().ToList();
int distance = 0, similarityScore = 0;

for (var i = 0; i < list1.Count; i++)
{
    distance += Math.Abs(list1[i] - list2[i]);
    similarityScore += list1[i] * list2.Count(item => item == list1[i]);
}

Console.WriteLine($"Part 1 : {distance}\nPart 2 : {similarityScore}");