using System;

public class Program

{

    public static void Main()

    {

        Hello(

            new int [] {1, 2, 1, 2, 3},

            new int [][] {

                new int [] {1, 2},

                new int [] {3}});

    }

    public static Tuple<int[], int>[] Hello(int [] x, int [][] y)

    {

        foreach (var z in y) Console.WriteLine(z.Length);

        Console.WriteLine(x.Length);

        Console.WriteLine(x.GetType());

        return new Tuple<int[], int>[] {

            new Tuple<int[], int>(new int[] {1, 2}, 2),

            new Tuple<int[], int>(new int[] {3}, 1)

        };

    }

}