UVA10124 Subway

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=13&page=show_problem&problem=1065 [PDF](https://uva.onlinejudge.org/external/101/p10124.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10124/e00190338bded0d7bf4e4bf5ee508f49ce967db6.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10124/670edc498c19400ee9998620e54d64025cb59e5e.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10124/027d2203b20cb251664db25b9bf1d4713ec2e270.png)