Leetcode simple question: check whether each row and column contain all integers

subject

For a size of n x n In terms of the matrix of , If each row and column contains from 1 To n Of All Integers （ contain 1 and n）, The matrix is considered to be a It works matrix .
Give you a size of n x n The integer matrix of matrix , Please judge whether the matrix is an effective matrix ： If it is , return true ; otherwise , return false .
Example 1：

Input ：matrix = [[1,2,3],[3,1,2],[2,3,1]]
Output ：true
explain ： In this case ,n = 3 , Each row and column contains numbers 1、2、3 .
therefore , return true .
Example 2：

Input ：matrix = [[1,1,1],[1,2,3],[1,2,3]]
Output ：false
explain ： In this case ,n = 3 , But the first row and first column do not contain numbers 2 and 3 .
therefore , return false .
Tips ：
n == matrix.length == matrix[i].length
1 <= n <= 100
1 <= matrix[i][j] <= n
source ： Power button （LeetCode）

Their thinking

   Just check whether there are repeated numbers in each row of the matrix , Whether there is a duplicate number in each column .

class Solution:
    def checkValid(self, matrix: List[List[int]]) -> bool:
        for i in matrix:  # Check each line 
            if len(set(i))!=len(matrix):
                return False
        temp=set()
        for i in range(len(matrix)):  # Check each column 
            temp.clear()
            for j in range(len(matrix)):
                temp.add(matrix[j][i])
            if len(temp)!=len(matrix):
                return False
        return True