UVA800 Crystal Clear

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=741 [PDF](https://uva.onlinejudge.org/external/8/p800.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA800/28938c5caa40a105de5c1bc1b8231ed19392cbd2.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA800/6aa0d38f98a648b573729a5294c776f6c268f6db.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA800/b705adf2a35d5849075c1348e2b04182cdecd974.png)