@[UperFicial](/user/360511)
by gaozitao1 @ 2021-10-21 16:16:24
@[gaozitao1](/user/237871) /yiw
by UperFicial @ 2021-10-21 16:17:17
1. top 数组在 dfs2 的时候没有更新。
2. 线段树数组开小了。
3.
```cpp
inline int qpos(int l,int r)
{
if(l==r) return l;
int mid=(l+r)>>1;
if(query(1,1,n,l,mid)) return qpos(l,mid);
else return qpos(mid+1,r);
}
```
改成
```cpp
inline int qpos(int l,int r)
{
if(l==r) return l;
int mid=(l+r)>>1;
if(query(1,1,n,mid+1,r)) return qpos(mid+1,r);
else return qpos(l,mid);
}
by gaozitao1 @ 2021-10-21 16:17:56
@[UperFicial](/user/360511)
by gaozitao1 @ 2021-10-21 16:25:36
@[gaozitao1](/user/237871) 蟹蟹神仙/qq/qq
by UperFicial @ 2021-10-21 16:27:47