UVA12109 Fairies' Defence

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=243&page=show_problem&problem=3261 [PDF](https://uva.onlinejudge.org/external/121/p12109.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12109/d07603973668db827fd5f4104a85c2e05eed0391.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12109/145936c38ed984f5cadf7bcea9b76de4ecc7ce0a.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12109/9c058fcb1f1d0ec6b1615d712bd0280f3db697ef.png)