string相当于二维的char，开500005当然炸，事实上可以只开两个然后getchar
by No21 @ 2023-07-10 21:21:38
`string` 约等于 `char str[LEN]`, 所以不用二维
by aaron0919 @ 2023-07-10 21:29:11
@[xiaoman118](/user/720559) 用`char a[500005];`
by aaron0919 @ 2023-07-10 21:30:07
@[No21](/user/271556) @[aaron0919](/user/818165) 已经AC了，万分感谢！
by tyx20101117 @ 2023-07-10 21:53:11