UVA176 City Navigation

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=112 [PDF](https://uva.onlinejudge.org/external/1/p176.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA176/452823db84294bf3602f0e1d73b5ec99eaecf95f.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA176/f3c4b1ba0666f0898851fbd73ff335d8c52c411e.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA176/2f09b1a0ed8fe33ac28ef2cbc9af2eec366e20b9.png)