多边形 Polygon

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=229&page=show_problem&problem=3122 [PDF](https://uva.onlinejudge.org/external/119/p11971.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11971/99d2d5d6a8ba382694bafd2fbbaac2ebd19403c3.png)

输入输出格式

输入格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11971/e5f5b5e9df7021ffcfac08e361c4065852870009.png)

输出格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11971/8e9583db4718849bdd03883e6bdfba094a704229.png)

输入输出样例

输入样例 #1

2
1 1
2 2

输出样例 #1

Case #1: 0/1
Case #2: 1/4