[LeetCode] 766. Toeplitz Matrix

- Problem

766. Toeplitz Matrix
Given an m x n matrix, return true if the matrix is Toeplitz. Otherwise, return false.

A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same elements.

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 are:
"[9]", "[5, 5]", "[1, 1, 1]", "[2, 2, 2]", "[3, 3]", "[4]".
In each diagonal all elements are the same, so the answer is True.

Example 2:

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

Constraints:

• m == matrix.length
• n == matrix[i].length
• 1 <= m, n <= 20
• 0 <= matrix[i][j] <= 99

- 내 풀이

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

- 결과