isToeplitzMatrix.go

/* https://leetcode.com/problems/toeplitz-matrix/description/
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:
    1234
    5123
    9512

    In the above grid, the diagonals are "[9]", "[5, 5]", "[1, 1, 1]", "[2, 2, 2]", "[3, 3]", "[4]", and 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].
*/

package larray

func isToeplitzMatrix(matrix [][]int) bool {
	for i := 1; i < len(matrix); i++ {
		for j := 1; j < len(matrix[0]); j++ {
			if matrix[i][j] != matrix[i-1][j-1] {
				return false
			}
		}
	}
	return true
}