LeetCode Top Interview 150 - Matrix

This is merely my personal review of all the typical problems that constitute the mindset for Data Structures and Algorithms (DSA). python solution provided

For the remaining types of problems, please refer to my channel.

everecursion-优快云博客everecursion关注python,github,chatgpt领域.https://blog.youkuaiyun.com/gcsyymm

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Valid Sudoku

Valid Sudokuhttps://leetcode.cn/problems/valid-sudoku/

 Difficulty:MED

class Solution:
    def isValidSudoku(self, board: List[List[str]]) -> bool:
        # check each row is valid
        for row in board:
            row_set = set()
            for num in row:
                if num != ".":
                    if num in row_set:
                        return False
                    row_set.a