UVA12590 守卫II Guards II

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=441&page=show_problem&problem=4035 [PDF](https://uva.onlinejudge.org/external/125/p12590.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12590/449a706da72848f4696c3f2d6120c780c63c7664.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12590/3865300dbb5bcc77f2cfd0701e315be9330616e8.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12590/c55c7b2aeeab4cdd8dd93f54c4174b9027bb4929.png)