LeetCode Toeplitz Matrix【Easy】
- 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:
"[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.
Note:
- matrix will be a 2D array of integers.
- matrix will have a number of rows and columns in range [1, 20].
- matrix[i][j] will be integers in range [0, 99].
题目很简单，直接获取矩阵中的值，然后和下一个值进行比对，需要注意的是每行对比的元素可以除去最后一个。
public static boolean isToeplitzMatrix(int[][] matrix) {
//行
int row=matrix.length;
//列
int col = matrix[0].length;
/**
* 反面情况
*
*/
for (int i = 0; i < row-1; i++) {
for (int j=0;j<col-1;j++){
if(matrix[i][j]!=matrix[i+1][j+1]){
return false;
}
}
}
return true;
}
