~~您好，您为什么要强调您不是妹子等等~~
by 小玄XX @ 2018-11-25 12:13:43
不用了……
```cpp
down_from_top(p);
int ret = tree[ls(p)].sz + 1;
```
这两行本来写反了
by Aleph1022 @ 2018-11-25 12:15:18
@[I_love_him52](/space/show?uid=75840) orz
by memset0 @ 2018-11-25 12:33:36
> @[I_love_him52](/space/show?uid=75840) TQL
by arfa @ 2018-11-25 12:41:19