Created
August 21, 2016 12:46
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import itertools | |
steps = itertools.cycle([(0, 1), (1, 0), (0, -1), (-1, 0)]) | |
step = next(steps) | |
def next_step(x, y): | |
global step | |
oldv = x, y | |
x, y = x + step[0], y + step[1] | |
if min(x, y) < 0 or max(x, y) >= N or mat[x][y]: | |
step = next(steps) | |
return next_step(*oldv) | |
return x, y | |
N = 10 | |
mat = [[0]*N for _ in range(N)] | |
i, j = 0, -1 | |
for a in range(1, N*N + 1): | |
i, j = next_step(i, j) | |
mat[i][j] = a | |
print('\n'.join([' '.join([str(i).rjust(3) for i in row]) for row in mat])) |
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