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.

 1 class Solution {
 2     public boolean isToeplitzMatrix(int[][] matrix) {
 3         for (int i = 0; i < matrix.length - 1; i++) {
 4             for (int j = 0; j < matrix[i].length - 1; j++) {
 5                 if (matrix[i][j] != matrix[i + 1][j + 1]) return false;
 6             }
 7         }
 8         return true;
 9     }
10 }

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来源： https://www.cnblogs.com/beiyeqingteng/p/14527369.html