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sudoku_logic.py
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"""
5
123
532
"""
"""
3 7 5
8 5 3
7 9
4 8
52 4 1
6 8
9 42
3
81
"""
from copy import deepcopy
class SudokuSolver:
def __init__(self, sudoku):
self.sudoku = sudoku
self.can_change = [[True if self.sudoku[j][i] == ' ' else False for i in range(len(sudoku))] for j in
range(len(sudoku))]
self.answers = []
def validate(self):
for x in self.sudoku:
se = set()
for y in x:
if y in se:
return False
if y != " ":
se.add(y)
for i in range(len(self.sudoku)):
se = set()
for j in range(len(self.sudoku)):
if self.sudoku[j][i] in se:
return False
if self.sudoku[j][i] != " ":
se.add(self.sudoku[j][i])
if len(self.sudoku) == 9:
l = self.sudoku[0][0:3] + self.sudoku[1][0:3] + self.sudoku[2][0: 3]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[0][3:6] + self.sudoku[1][3:6] + self.sudoku[2][3: 6]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[0][6:9] + self.sudoku[1][6:9] + self.sudoku[2][6: 9]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[3][0:3] + self.sudoku[4][0:3] + self.sudoku[5][0: 3]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[3][3:6] + self.sudoku[4][3:6] + self.sudoku[5][3: 6]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[3][6:9] + self.sudoku[4][6:9] + self.sudoku[5][6: 9]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[6][0:3] + self.sudoku[7][0:3] + self.sudoku[8][0: 3]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[6][3:6] + self.sudoku[7][3:6] + self.sudoku[8][3: 6]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
l = self.sudoku[6][6:9] + self.sudoku[7][6:9] + self.sudoku[8][6: 9]
se = set()
for x in l:
if x != " ":
if x in se:
return False
se.add(x)
return True
def solve(self, idx):
if idx >= len(self.sudoku) * len(self.sudoku):
if self.validate():
self.answers.append(deepcopy(self.sudoku))
else:
x, y = idx // len(self.sudoku), idx % len(self.sudoku)
if self.can_change[x][y]:
past = self.sudoku[x][y]
for i in range(1, len(self.sudoku) + 1):
self.sudoku[x][y] = i
if self.validate():
self.solve(idx + 1)
self.sudoku[x][y] = past
else:
self.solve(idx + 1)
def get_answer(self):
self.solve(0)
return self.answers