Created
July 22, 2012 17:36
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Udacity CS258 - Sudoku Checker
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def get_groups(): | |
q = lambda f:[[f(i,j) for j in range(9)] for i in range(9)] | |
return q(lambda i,j:(i,j)) + q(lambda i,j:(j,i)) + q(lambda i,j:(i/3*3+j/3,i%3*3+j%3)) | |
# I think this is more readable than the one-liner: | |
# >> return [l for i in range(9) for l in zip(*[[(i,j),(j,i),(i/3*3+j/3,i%3*3+j%3)] for j in range(9)])] | |
def check_sudoku(grid): | |
# Check to see if grid is a list with 9 elements | |
if ((not type(grid) is list) or (len(grid) != 9)): return None | |
# Check to see if each row is a list with 9 elements | |
for row in grid: | |
if ((not type(row) is list) or (len(row) != 9)): return None | |
if set(map(len,grid)) != set([9]): return None | |
if min(map(min,grid)) < 0: return None | |
if max(map(max,grid)) > 9: return None | |
for s in get_groups(): | |
l = filter(None,[grid[i][j] for i,j in s]) | |
if len(l) != len(set(l)): return False | |
return True | |
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