大佬们帮帮忙
by 一月气聚 @ 2021-12-26 19:28:05
@[一月气聚](/user/420137)
我猜是建图的问题
```cpp
void add_edge(int x,int y){
edge[++enn].from=x;
edge[enn].to=y;
ed[enn].nxt=head[x];
head[x]=enn;
}
```
by sprads @ 2021-12-26 19:35:33
主页双帖（
by Yukinoshita_Yukino @ 2021-12-26 19:49:06