UVA11586 Train Tracks

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=27&page=show_problem&problem=2633 [PDF](https://uva.onlinejudge.org/external/115/p11586.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11586/f0cc77453ce9d2e0274fd7f2d6dfd4432e7e8fe7.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11586/fa02aa328a0f2787cd0079f951c4bd5efc531da0.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11586/29f2019c65dba1ebb0f88d12f76b6af523ca9621.png)