Freckles
题目描述
[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=12&page=show_problem&problem=975
[PDF](https://uva.onlinejudge.org/external/100/p10034.pdf)
![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10034/b178fe12ab2684d531a2d302e9fc9c585ba1f680.png)
输入输出格式
输入格式
![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10034/638a354ad459c082b972d9ad33cc8fce903e7399.png)
输出格式
![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10034/5d75816129b6b4e6aa59135397a8bbaf14fd87c7.png)
输入输出样例
输入样例 #1
1
3
1.0 1.0
2.0 2.0
2.0 4.0
输出样例 #1
3.41