using System;
public class Test
{
public static void Main()
{
var arr1 = new int[,] { {1,2}, {3,4} };
Console.WriteLine("arr1 : {0} {1}", arr1[0,0], arr1[1,0]);
var arr2 = new int[][] { new int[]{1,2}, new int[]{3,4} };
Console.WriteLine("arr2 : {0} {1}", arr2[0][0], arr2[1][0]);
}
}
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