UVA10608 Friends

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=18&page=show_problem&problem=1549 [PDF](https://uva.onlinejudge.org/external/106/p10608.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10608/b4ddcdd9cce04d5a2ed244d40276f70e1b42015d.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10608/c2bce8f21043225c0a7c942ccd9c1516d00b1db9.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10608/86113b2c009e938f145d25c60acc0f7bfa8e978c.png)