UVA12154 Shrinking Polygons

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=243&page=show_problem&problem=3306 [PDF](https://uva.onlinejudge.org/external/121/p12154.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12154/6dde284cbc18e9f2090ce3caa91d9a110d057a3d.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12154/8b1f7fca08b35404fbee11d13892c35e89569682.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12154/489175943f8954ebd57933918f01a821f6271c23.png)