EasyNo. 2133
Check if Every Row and Column Contains All Numbers — LeetCode 2133 Python Solution
- Pattern
- Matrix and Grid
- Topics
- Array, Hash Table, Matrix
- Reading time
- 2 min
- Source
- leetcode.com
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
- Time
- O(n2)
- Space · auxiliary
- O(n)
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.
Related problems
| No. | Problem | Difficulty |
|---|---|---|
| 0036 | Valid Sudoku | Medium |
| 0037 | Sudoku Solver | Hard |
| 0073 | Set Matrix Zeroes | Medium |
| 0840 | Magic Squares In Grid | Medium |
| 0959 | Regions Cut By Slashes | Medium |
| 1072 | Flip Columns For Maximum Number of Equal Rows | Medium |
Frequently asked questions
- How hard is LeetCode 2133. Check if Every Row and Column Contains All Numbers?
LeetCode 2133. Check if Every Row and Column Contains All Numbers is rated Easy on LeetCode.
- What is the time complexity of LeetCode 2133. Check if Every Row and Column Contains All Numbers?
The Python solution on this page runs in O(n2).
- What is the space complexity of LeetCode 2133. Check if Every Row and Column Contains All Numbers?
The Python solution on this page uses O(n) auxiliary space.
- What topics does LeetCode 2133. Check if Every Row and Column Contains All Numbers cover?
LeetCode 2133. Check if Every Row and Column Contains All Numbers is tagged Array, Hash Table and Matrix on LeetCode.