据我所知,虽然声明需要条件才能工作,但在这里它没有任何作用; 怎么可能？while q:工作怎么样？
代码如下:......
q = set([])
for i in range(N):
q.add((i, 0))
q.add((i, M - 1))
w[i][0] = h[i][0]
w[i][M - 1] = h[i][M - 1]
for i in range(M):
q.add((0, i))
q.add((N - 1, i))
w[0][i] = h[0][i]
w[N - 1][i] = h[N - 1][i]
while q:
ci, cj = q.pop()
for ii, jj in ((0, 1), (0, -1), (1, 0), (-1, 0)):
ni, nj = ci + ii, cj + jj
if 0 <= ni …