0766. Toeplitz Matrix

# 766. Toeplitz Matrix#

## 题目 #

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

Now given an `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 are:
"", "[5, 5]", "[1, 1, 1]", "[2, 2, 2]", "[3, 3]", "".
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.
``````

Note:

1. `matrix` will be a 2D array of integers.
2. `matrix` will have a number of rows and columns in range `[1, 20]`.
3. `matrix[i][j]` will be integers in range `[0, 99]`.

1. 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?
2. What if the matrix is so large that you can only load up a partial row into the memory at once?

## 解题思路 #

• 给出一个矩阵，要求判断矩阵所有对角斜线上的数字是否都是一个数字。
• 水题，直接循环判断即可。

## 代码 #

``````
package leetcode

func isToeplitzMatrix(matrix [][]int) bool {
rows, columns := len(matrix), len(matrix)
for i := 1; i < rows; i++ {
for j := 1; j < columns; j++ {
if matrix[i-1][j-1] != matrix[i][j] {
return false
}
}
}
return true
}

`````` Dec 6, 2021 Edit this page