2133. Check if Every Row and Column Contains All Numbers

Easy

An n x n matrix is valid if every row and every column contains all the integers from 1 to n (inclusive).

Given an n x n integer matrix matrix, return true if the matrix is valid. Otherwise, return false.

Example 1:

Input: matrix = [[1,2,3],[3,1,2],[2,3,1]]
Output:
 true
Explanation:
 In this case, n = 3, and every row and column contains the numbers 1, 2, and 3.
Hence, we return true.

Example 2:

Input: matrix = [[1,1,1],[1,2,3],[1,2,3]]
Output:
 false
Explanation:
 In this case, n = 3, but the first row and the first column do not contain the numbers 2 or 3.
Hence, we return false.

Constraints:

• n == matrix.length == matrix[i].length

• 1 <= n <= 100

• 1 <= matrix[i][j] <= n

解題

Runtime: 215 ms, faster than 76.19%

Memory Usage: 7.8 MB, less than 80.95%

func checkValid(matrix [][]int) bool {
    length:= len(matrix)
    arr := make([]int, length)
    
    for x := 0; x < len(matrix); x++ {
        flag := x % 2
        for y := 0; y < len(matrix); y++ {
            if arr[matrix[x][y]-1] != flag {
                return false
            }
            arr[matrix[x][y]-1] = (x+1) % 2
        }
    }
    
    arr = make([]int, length)
    for y := 0; y < len(matrix); y++ {
        flag := y % 2
        for x := 0; x < len(matrix); x++ {
            if arr[matrix[x][y]-1] != flag {
                return false
            }
            arr[matrix[x][y]-1] = (y+1) % 2
        }
    }
    
    return true
}