UVA12795 Ecology

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=823&page=show_problem&problem=4660 [PDF](https://uva.onlinejudge.org/external/127/p12795.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12795/75c45f6c4bf5f1d6418257f14298049ab6d6d4c1.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12795/ba49618ab87a81198273a011972808452dd108ef.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12795/9b22add46afebe0174db9770d15952a62ae9cf18.png)