UVA11675 Happy Friends

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=78&page=show_problem&problem=2722 [PDF](https://uva.onlinejudge.org/external/116/p11675.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11675/6604dd1133478e1e284650d6aa7c3e790113099c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11675/e7b8372310b60f8ce2bcdabe553dd68adf33498c.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11675/306226932ff18ea088ffff3b4c32c5c6b8f70400.png)