class Solution:# @param board, a 9x9 2D array# @return a booleandef isValidSudoku(self, board): rows = [list(lst[::]) for lst in board] columns = [[lst[idx] for lst in board] for idx in range(9)] blocks_origin = [board[row][column] for x in [[0, 1, 2], [3, 4, 5], [6, 7, 8]] for y in [[0, 1, 2], [3, 4, 5], [6, 7, 8]] for row in x for column in y] # 利用一些技巧直接按塊儲存數據 blocks = [[blocks_origin[row * 9 + column] for column in range(9)] for row in range(9)] check = lambda lst: all([lst.count(x) == 1 for x in lst if x != '.']) # 判斷一條記錄（按某種方式排列的九個數字）是否合法 return all([check(x) for style in (rows, columns, blocks) for x in style]) # 一步搞定