UVA13038 Directed Forest

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=866&page=show_problem&problem=4936 [PDF](https://uva.onlinejudge.org/external/130/p13038.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13038/6c3dd934b6d2271d76e1f773e10ad34bc9f2b368.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13038/f1168436e4f789117815e1e1f11d0045c488920d.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13038/68378b880ae0e06be6d9c4411674a1abf2f552f9.png)