UVA11455 Behold my quadrangle

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=26&page=show_problem&problem=2450 [PDF](https://uva.onlinejudge.org/external/114/p11455.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11455/15ad1be7f4022f7f701d3fbd313c847d0181c631.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11455/0cf6385bdd98a8a17114f2a346660085e54f9f2e.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11455/6f3d2f588a861064cf21849cb0231196aea5b85d.png)