766. Toeplitz Matrix

A Matrix is Toeplitz if every diagonal from top-left to bottom-right have the same element.

Now given a M x N matrix, return True if and only if the matrix is Toeplitz.

Example 1:

Input:
Matrix = [
[1,2,3,4],
[5,1,2,3],
[9,5,1,2]]
Output:true
Explanation:
In the above grid, the diagonals is:
"[9]", "[5, 5]", "[1, 1, 1]", "[2, 2, 2]", "[3, 3]", "[4]".
In each diagonal all elements was the same, so the answer is True.

Example 2:

Input:
Matrix = [
[+],
[2,2]]
Output:false
Explanation:
The diagonal "[1, 2]" has different elements.

Note:

1. Matrix would be a 2D array of integers.
2. Matrix would has a number of rows and columns in range [1, 20].
3. MATRIX[I][J] would be integers in range [0, 99].

Follow up:

1. What if the matrix was stored on disk, and the memory is limited such so can only load at most one row of the matrix Into the memory at once?
2. What if the matrix was so large, can only load up a partial row to the the memory at once?

class Solution:    def isToeplitzMatrix(self, matrix):        """        :type matrix: List[List[int]]        :rtype: bool        """        if len(matrix)==0:            return True        for i in range(1,len(matrix)):            for j in range(1,len(matrix[0])):                if matrix[i][j]!=matrix[i-1][j-1]:                    return False        return True

766. Toeplitz Matrix