【有效的数独】python

很好，超级暴力做法，能过就行，优雅个锤子啊

优雅的做法，绅士，噢听说叫模拟

很好，超级暴力做法，能过就行，优雅个锤子啊

我直接11个2层for循环暴力秒杀

class Solution:
    def isValidSudoku(self, board: List[List[str]]) -> bool:
        #9宫格判断
           dit=dict()
           for i in range(3):
             for j in range(3):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(3,6):
             for j in range(3):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(6,9):
             for j in range(3):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(3):
             for j in range(3,6):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(3):
             for j in range(6,9):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(3,6):
             for j in range(3,6):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(3,6):
             for j in range(6,9):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(6,9):
             for j in range(3,6):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
           for i in range(6,9):
             for j in range(6,9):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
        #行判断
           dit=dict()
           for i in range(9):
              dit=dict()
              for j in range(9):
                if board[i][j] in dit and board[i][j]!='.':
                    return False
                dit[board[i][j]]=1
           dit=dict()
        #列判断
           for i in range(9):
              dit=dict()
              for j in range(9):
                if board[j][i] in dit and board[j][i]!='.':
                    return False
                dit[board[j][i]]=1
           return True

优雅的做法，绅士，噢听说叫模拟

其实判断过程（行列）都差不多，只是那个9宫格的计算判断真的厉害（固定i坐标，然后9次遍历j，将坐标映射到一个九宫格里面，就能完成一个九宫格的遍历）

row, col = i // 3 * 3 + j // 3, i % 3 * 3 + j % 3

class Solution:
    def isValidSudoku(self, board: List[List[str]]) -> bool:
        for i in range(9):
            #这里用的是set()集合，实际上用字典效果也一样
            sr,sc,ss=set(),set(),set()
            for j in range(9):
                #行判断
                if board[i][j]!='.':
                    if board[i][j] in sr:
                        return False
                    sr.add(board[i][j])
                #列判断
                if board[j][i]!='.':
                    if board[j][i] in sc:
                        return False
                    sc.add(board[j][i])
                #9宫格判断
                row,col=i//3*3+j//3,i%3*3+j%3
                if board[row][col]!='.':
                    if board[row][col] in ss:
                        return False
                    ss.add(board[row][col])
        return True