UVA13047 Arrows

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=866&page=show_problem&problem=4945 [PDF](https://uva.onlinejudge.org/external/130/p13047.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13047/e3b03ce9f00084bee325ad95b158d77ffcf56cfa.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13047/ec47e92d018058414a26f097d7e1357905d40ce3.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13047/7989b90d7cfabe451c9243ebb193d12e2b678dbd.png)