23行
```cpp
if(hson[now]=-1 <- here
```
应改为
```cpp
if(hson[now]==-1||siz[to]>siz[hson[now]])hson[now]=to;
```
by 望月Asta @ 2021-08-27 14:47:45
@[望月Asta](/user/122520) 实测这不是问题（
by YaeMik0 @ 2021-08-27 14:48:26
函数``max_chain``
最后的更新改为
```cpp
if(dep[x]>dep[y])swap(x,y);
ans=max(ans,max_query(r[now_c],1,n,dfn[x],dfn[y]));
```
by 望月Asta @ 2021-08-27 14:53:07
@[望月Asta](/user/122520) 活跃在洛谷所有角落的望月asta
by liubw_ @ 2021-09-29 23:00:56