UVA11939 Landing Navigation

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=229&page=show_problem&problem=3090 [PDF](https://uva.onlinejudge.org/external/119/p11939.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11939/7176c1984090eaea490f93b594ff4d666c12902c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11939/db857d806c91fd7ca22bafde296259ad6c4ca45d.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11939/1c4f09c8094d007f9bac7e422be030e0435fd8b7.png)