UVA10039 Railroads

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=12&page=show_problem&problem=980 [PDF](https://uva.onlinejudge.org/external/100/p10039.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10039/1f72732fa981013ee4f7419507da5809ddaa5153.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10039/762452c0468758951b917e668062048d58a97071.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10039/efd9903a776f697aeea25b26a1e908fd2f28326c.png)