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leet_36.py
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leet_36.py
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# https://leetcode.com/problems/valid-sudoku/
# Runtime: 40 ms, faster than 98.65% of Python3 online submissions for Valid Sudoku.
class Solution:
def isValidSudoku(self, board):
# validate rows
for row in board:
values = set()
for cell in row:
if cell != '.':
if cell in values:
return False
values.add(cell)
# validate cols
i, j = 0, 0
while i < 9:
values = set()
j = 0
while j < 9:
cell = board[j][i]
if cell != '.':
if cell in values:
return False
values.add(cell)
j += 1
i += 1
# validate districts
for dx in range(3):
cur_dx = 3 * dx
for dy in range(3):
values = set()
cur_dy = 3 * dy
for i in range(cur_dx, cur_dx + 3):
for j in range(cur_dy, cur_dy + 3):
cell = board[i][j]
if cell != '.':
if cell in values:
return False
values.add(cell)
return True
if __name__ == '__main__':
s = Solution()
board = [
[".", ".", "4", ".", ".", ".", "6", "3", "."],
[".", ".", ".", ".", ".", ".", ".", ".", "."],
["5", ".", ".", ".", ".", ".", ".", "9", "."],
[".", ".", ".", "5", "6", ".", ".", ".", "."],
["4", ".", "3", ".", ".", ".", ".", ".", "1"],
[".", ".", ".", "7", ".", ".", ".", ".", "."],
[".", ".", ".", "5", ".", ".", ".", ".", "."],
[".", ".", ".", ".", ".", ".", ".", ".", "."],
[".", ".", ".", ".", ".", ".", ".", ".", "."]
]
assert s.isValidSudoku(board) == False