UVA11842 Flatland

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=2942 [PDF](https://uva.onlinejudge.org/external/118/p11842.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11842/630214d2dd2a7fc6e24145c42e1ac61ea014094e.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11842/0f1d30eacf5338cbe3e505fb0ca91b83e95e1a29.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11842/f9fad1c7fa8c062f45a1aa3c94e6240f5350f161.png)