UVA11833 Route Change

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=2933 [PDF](https://uva.onlinejudge.org/external/118/p11833.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11833/dd51340f088d67edf05f43aaf7cc741aeadb45b3.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11833/4f3e2f85e48ef2a8a628f0f2c609d1e6c897ab61.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11833/efac4c9c0d3f08236612dfc694b8d3da47ced4fc.png)