Toeplitz matrix

PROBLEM :

A Toeplitz (or diagonal-constant) matrix is a matrix in which each descending diagonal from left to right is constant, i.e., all elements in a diagonal are same.
Given a matrix A of order N X M your task is to complete the function isToeplitz which returns true if the matrix is Toeplitz otherwise returns false.

Input:
The first line of input contains an integer T denoting the no of test cases .Then T test cases follow . Each test case contains two lines. The first line of each test case contains two integers N and M denoting the order of the matrix . Then in the next line are N*M space separated values of the matrix.

Output:
The output for each test case will be 1 if the matrix is Toeplitz else it will be 0.

Constraints:
1<=T<=50
1<=N,M<=40
1<=A[][]<=100

Example(To be used only for expected output):
Input
2
3 3
6 7 8 4 6 7 1 4 6
2 3
1 2 3 4 5 6
Output
1
0

Explanation
(i) The first test case represents a 3x3 matrix which looks like
     6 7  8
     4 6  7
     1 4  6
     Output: 1(True) as values in all diagonals are same.

(ii) In second test case matrix of order 2x3 will be
     1 2 3
     4 5 6
     Output: 0(False) as values in all diagonals are not same.

--------------------------------------------------------------------------------
SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

/*You are required to complete this method*/

bool isToepliz(int A[MAX][MAX],int N,int M)
{
    int i,j ;
    for(i=1;i<N;i++)
    {
        for(j=1;j<M;j++)
        {
            if(A[i][j]!=A[i-1][j-1])
                return false ;
        }
    }
    return true ;
}

---------------------------------------------------------------------------------

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