Array - wave print row wise

#1

no error is coming giving output perfect but not passing any testcase got 0 score

import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int M = sc.nextInt();
int N = sc.nextInt();
//2d array declaration
int [][] arr = new int[M][N];

	for(int i=0; i<=arr.length-1;i++){
		for(int j=0;j<=arr[i].length-1;j++)
		{
			arr[i][j] = sc.nextInt();
		}
	}
	display(arr);

}
public static void display(int [][] arr)
{
	for(int i=0;i<=arr.length-1;i++){
		if(i%2==0)
		{
			for(int j=0;j<=arr.length-1;j++)
			{
				System.out.print(arr[i][j]+ ", ");
			}
		}
		else
		{
			for(int j=arr.length-1;j>=0;j--)
			{
				System.out.print(arr[i][j]+ ", ");
			}
		}
	}
	System.out.print("END");
}

}

#2

@Naman_Gupta,
https://ide.codingblocks.com/s/253066 corrected code.

The error was that the matrix is not square matrix for every test case.

An easy way to check code is to put input as:
2 3
1 2 3
4 5 6

#3

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