UVA11572 唯一的雪花 Unique Snowflakes

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=27&page=show_problem&problem=2619 [PDF](https://uva.onlinejudge.org/external/115/p11572.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11572/000f93543b4021ab3e6ea07af250f46d9867cb64.png)

Input Format

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Output Format

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