class Solution:def solveNQueens(self, n: int) -> List[List[str]]:if not n: return []res = []board = [["." for _ in range(n)] for _ in range(n)]def isValid(board,row,col):# 同一列for i in range(len(board)):if board[i][col] == 'Q':return False# 左上角i = row - 1j = col - 1while i >= 0 and j >= 0:if board[i][j] == 'Q':return Falsei -= 1j -= 1# 右上角i = row - 1j = col + 1while i >= 0 and j < len(board):if board[i][j] == 'Q':return Falsei -= 1j += 1return Truedef dfs(board, row, n):if row == n:temp_res = []for temp in board:temp_str = "".join(temp)temp_res.append(temp_str)res.append(temp_res)for col in range(n):if not isValid(board, row, col):continueboard[row][col] = 'Q'dfs(board, row + 1, n)board[row][col] = '.'dfs(board, 0, n)return res

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