@[p_b_p_b](/user/76481) 可能是这个问题：[link](https://www.luogu.com.cn/discuss/398707?page=1)
by JA2012 @ 2022-05-26 11:23:22
@[p_b_p_b](/user/76481) 抱歉我错了，是你的add函数里面
```cpp
cut(f,x+n);
cut(t,x+n);
```
应该为
```cpp
cut(edge[x].f,x+n);
cut(edge[x].t,x+n);
```
by JA2012 @ 2022-05-26 11:53:02