Check if given matrix is Toeplitz matrix or not

Given an NxN matrix, check if it is Toeplitz matrix or not. A Toeplitz matrix or diagonal-constant matrix is a matrix in which each descending diagonal from left to right is constant.

For instance, the following matrix is a Toeplitz matrix:

Toeplitz Matrix

Any N×N matrix A of the form is a Toeplitz matrix if
A(i, j) = A(i+1, j+1) = A(i+2, j+2) and so on..

Here, the i, j element of A is denoted A(i, j).



The idea is very simple. We traverse the matrix once and for each element (i, j), we check if it is same as its immediate diagonal element (i+1, j+1) or not. If we found any element which differs from its immediate diagonal element, the matrix is not Toeplitz and we return false.


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Toepliz matrix

Time complexity of above solution is O(N2).
Auxiliary space used by the program is O(1).


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