using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
		int[][] a = new int[10][];
        for (int i = 0 ; i != 10 ; i++) {
            a[i] = new int[20];
            a[i][0] = i+100;
	    }
	    int[][] copy = a.Clone() as int[][];
        a[0][0] = 1234;
        Console.WriteLine(a[0][0]);
        Console.WriteLine(copy[0][0]);
	}
}