PatrikMelanderVing

using System;

public static class CantorPairUtility {
    
    public static int CantorPair(int x, int y) {
        return (((x + y) * (x + y + 1)) / 2) + y;
    }

    public static void ReverseCantorPair(int cantor, out int x, out int y) {
        var t = (int) Math.Floor((-1 + Math.Sqrt(1 + 8 * cantor)) / 2);