标准数独概念如下：
现有求解代码：
import datetime
sudoku2 = [
[0, 4, 0, 5, 1, 7, 0, 6, 0],
[2, 0, 0, 0, 4, 0, 0, 0, 9],
[0, 0, 3, 0, 0, 0, 5, 0, 0],
[5, 0, 0, 4, 0, 1, 0, 0, 7],
[9, 2, 0, 0, 0, 0, 0, 8, 5],
[7, 0, 0, 9, 0, 5, 0, 0, 1],
[0, 0, 8, 0, 0, 0, 7, 0, 0],
[6, 0, 0, 0, 7, 0, 0, 0, 8],
[0, 5, 0, 8, 6, 9, 0, 3, 0]
]
def wr_sudoku(board): # 判断数独是否符合条件
# 判断一行是否有效
for i in range(9):
for j in board[i]:
if (j != '.') and (board[i].count(j) > 1):
return False
# 判断一列是否有效
column = [k[i] for k in board]
for n in column:
if (n != '.') and (board[i].count[n] > 1):
return False
# 判断九宫格是否有效
for i in range(3):
for j in range(3):
grid = [tem[j * 3:(j + 1) * 3] for tem in board[i * 3:(i + 1) * 3]]
merge_str = grid[0] + grid[1] + grid[2] # 合并为一个list[]
for m in merge_str:
if (m != '.') and (merge_str.count(m) > 1):
return False
return True
class fill_sudoku(object):
def __init__(self, board):
self.b = board
self.t = 0
def check(self, x, y, value): # 检查每行每列及每九宫是否有相同项
for row_item in self.b[x]:
if row_item == value:
return False
for row_all in self.b:
if row_all[y] == value:
return False
row, col = int(x / 3) * 3, int(y / 3) * 3
row3col3 = self.b[row][col:col + 3] + self.b[row + 1][col:col + 3] + self.b[row + 2][col:col + 3]
for row3col3_item in row3col3:
if row3col3_item == value:
return False
return True
def get_next(self, x, y): # 得到下一个未填项
for next_soulu in range(y + 1, 9):
if self.b[x][next_soulu] == 0:
return x, next_soulu
for row_n in range(x + 1, 9):
for col_n in range(0, 9):
if self.b[row_n][col_n] == 0:
return row_n, col_n
return -1, -1 # 若无下一个未填项，返回-1
def try_it(self, x, y): # 主循环
if self.b[x][y] == 0:
for i in range(1, 10): # 从1到9尝试
self.t += 1
if self.check(x, y, i): # 符合 行列宫均无条件 的
self.b[x][y] = i # 将符合条件的填入0格
next_x, next_y = self.get_next(x, y) # 得到下一个0格
if next_x == -1: # 如果无下一个0格
return True # 返回True
else: # 如果有下一个0格，递归判断下一个0格直到填满数独
end = self.try_it(next_x, next_y)
if not end: # 在递归过程中存在不符合条件的，即 使try_it函数返回None的项
self.b[x][y] = 0 # 回朔到上一层继续
else:
return True
def start(self):
begin = datetime.datetime.now()
if self.b[0][0] == 0:
self.try_it(0, 0)
else:
x, y = self.get_next(0, 0)
self.try_it(x, y)
for i in self.b:
print(i)
end = datetime.datetime.now()
print('cost time: ', end - begin)
print('times: ', self.t)
return
s = fill_sudoku(sudoku2)
s.start()
求改编代码解电子表数独和算式数独
