@[tianyu_awa](/user/716260) pushup 里面
```cpp
siz[x] = siz[ch[x][0]] + siz[ch[x][1]];
```
改为
```cpp
siz[x] = siz[ch[x][0]] + siz[ch[x][1]]+1;
```
by Yuzu_Soft @ 2024-02-05 15:05:42
@[Yuzu_Soft](/user/353976) thx
by tianyu_awa @ 2024-02-05 20:08:15