@[sc_iwe](/user/544449)
边界错了，检查这句：
`if x < 0 or x >= n or y < 0 or y >= m`
by UruhaRushia @ 2023-07-11 11:00:00
@[UruhaRushia](/user/188950)
谢谢dalao，AC了
by sc_iwe @ 2023-07-11 11:11:42