UVA12894 Perfect Flag

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=861&page=show_problem&problem=4759 [PDF](https://uva.onlinejudge.org/external/128/p12894.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12894/c9f16ff589f732e759fcd026033558ff75a782f9.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12894/22b4d73d109cb90917bbfa5b821d0dc87c2815d3.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12894/94fe28e0f8bd38661dc9e831ed76bfd48bc48437.png)