UVA746 Polygon Visibility

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=9&page=show_problem&problem=687 [PDF](https://uva.onlinejudge.org/external/7/p746.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA746/1ca1afe3e070dd12da4848820a720bee25fb0ce1.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA746/83bce9ff319d8e8d8d5b57210e5ac18328d23be2.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA746/fbcd51b9de69774591065db83cd6004dd986ce72.png)