Check if Every Row and Column Contains All Numbers — LeetCode 2133 Python Solution

The problem

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.

Example

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.

Python solution

class Solution:
    def checkValid(self, matrix: List[List[int]]) -> bool:
        n = len(matrix)
        return all(len(set(row)) == n for row in chain(matrix, zip(*matrix)))

Complexity

Pattern: Matrix and Grid

Treat a 2-D grid as a graph whose neighbours are the four adjacent cells. LeetCode 2133. Check if Every Row and Column Contains All Numbers is filed here because LeetCode tags it Matrix, which is the vocabulary this hub collects.

The matrix and grid guide has the Python template for the pattern and the 216 LeetCode problems that use it.

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