UVA258 Mirror Maze

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=4&page=show_problem&problem=194 [PDF](https://uva.onlinejudge.org/external/2/p258.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA258/0b3546c9c0025d06a77c00668b2a5612b79d1eb1.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA258/10b91f8d7e1a174ea077fd43a94029f4b7d17592.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA258/4d92d5f73ebb4c40bc94afac6330b72a5c2eff54.png)