ananya.md

class Solution: def isValidSudoku(self, board: List[List[str]]) -> bool:

    for i in range(9):
        l,m,k=set(),set(),set()
        for j in range(9):
            if board[i][j]!='.':
                if board[i][j] in l :
                    return False
                l.add(board[i][j])
            if board[j][i]!='.': 
                if board[j][i] in m:
                    return False
                m.add(board[j][i])
            r=3*(i//3)+j//3
            c=j%3+3*(i%3)
            if board[r][c] != '.': 
                if board[r][c] in k:
                    return False
                k.add(board[r][c])
                
    return True