UVA10691 Subway

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=18&page=show_problem&problem=1632 [PDF](https://uva.onlinejudge.org/external/106/p10691.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10691/e14399dffda6544aae2d4f2323fe597b5cd0e846.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10691/9c1ec551c60c56d7ab5605ecd071c748e92356bb.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10691/ad370c83fd35f3d069f57cece7962f0c3d692c6d.png)