
Computerphile Sudoku Python
grid = [
[ 5, 0, 0, 1, 0, 0, 7, 0, 0 ],
[ 0, 2, 0, 0, 0, 7, 1, 0, 0 ],
[ 3, 0, 1, 4, 0, 0, 8, 5, 2 ],
[ 6, 1, 0, 5, 7, 2, 4, 0, 8 ],
[ 0, 0, 2, 9, 6, 0, 0, 0, 0 ],
[ 0, 4, 0, 0, 3, 0, 6, 2, 7 ],
[ 4, 5, 9, 0, 8, 0, 0, 7, 0 ],
[ 1, 3, 0, 0, 0, 0, 9, 8, 6 ],
[ 2, 0, 0, 0, 1, 0, 0, 4, 3 ]
]
def possible(y,x,n):
for i in range(0,9):
if grid[y][i] == n:
return False
for i in range(0,9):
if grid[i][x] == n:
return False
x0 = (x//3)*3
y0 = (y//3)*3
for i in range(0,3):
for j in range(0,3):
if grid[y0+i][x0+j] == n:
return False
return True
def solve():
print("solving")
for y in range(9):
for x in range(9):
if grid[y][x] == 0:
for n in range(1,10):
if possible(y,x,n):
grid[y][x] = n
solve()
grid[y][x] = 0
return
printGrid()
input()
def printGrid() :
for n in range(0,9):
print(grid[n])
solve()
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