UVA13159 Within Arm's Reach

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=871&page=show_problem&problem=5059 [PDF](https://uva.onlinejudge.org/external/131/p13159.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13159/18acc608e2a19ec1e7bed4682112e476abf32bbf.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13159/6890a879f220003d6388bb50e03b9fe8006c4d76.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13159/576811c95ef263807826b2f18f6b2f12b046d0c0.png)