UVA851 Maze

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=792 [PDF](https://uva.onlinejudge.org/external/8/p851.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA851/f9df8ede6e5f3a7ab9f7045b2b1ca143a7a4e5e6.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA851/24fe6b2a59d46eb4d10711f26784f14cacfe7051.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA851/f3870abb4fc1cd7548c9b071c746ab28e32c073c.png)