UVA10585 Center of symmetry

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=17&page=show_problem&problem=1526 [PDF](https://uva.onlinejudge.org/external/105/p10585.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10585/2036a71f2bfb2c41a17727292478b57e7390a305.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10585/d2053e9e6c44dfbf50016f0ded1b8edfe741d59f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10585/773d56e8153e26ac964adb230ae3c4f241c3dad5.png)