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:trueExplanation: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:falseExplanation:The diagonal "[1, 2]" has different elements.

**Constraints:**

`m == matrix.length`

`n == matrix[i].length`

`1 <= m, n <= 20`

`0 <= matrix[i][j] <= 99`

**Follow up:**

- What if the
`matrix`

is stored on disk, and the memory is limited such that you can only load at most one row of the matrix into the memory at once? - What if the
`matrix`

is so large that you can only load up a partial row into the memory at once?

class Solution {
public boolean isToeplitzMatrix(int[][] matrix) {
}
}