团主您睡了吧，熬夜有害健康
by LRL65 @ 2020-04-22 00:25:43
对啊团主dalao
熬夜对身体不好
by Luban @ 2020-04-22 07:24:18
熬夜伤身体，且行且珍惜啊
by Unordered_OIer @ 2020-04-22 07:42:37
```cpp
for(int i=1;i<=m;i++)
{
scanf("%d%d",&u[i],&v[i]);
if(u[i]==v[i])
{
continue;
}
before[i]=now[u[i]];
now[u[i]]=i;
}
```
个人感觉是这里有问题
by Unordered_OIer @ 2020-04-22 07:50:57
~~00:23算什么，你们见过01:23的洛谷吗，反正我见过~~
by Spasmodic @ 2020-07-08 07:50:32