UVA675 Convex Hull of the Polygon

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=8&page=show_problem&problem=616 [PDF](https://uva.onlinejudge.org/external/6/p675.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA675/47ae1744c5dd3aded5a24467e97006a25b946a88.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA675/0e78b11131d61b112b529e60666fb52b5042d06f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA675/6ef41450e4b310b42abc3825ecd73acf2b7c2971.png)