UVA811 The Fortified Forest

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=752 [PDF](https://uva.onlinejudge.org/external/8/p811.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA811/60c91191e36e4f107821b8c28d85f0e1f0278a11.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA811/5b2c3c390f6910f9a798e03c195f4c9b4fee3065.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA811/11a54cb4ed0f756ea414ef9d1eb82b33401922c2.png)