UVA247 电话圈 Calling Circles

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=4&page=show_problem&problem=183 [PDF](https://uva.onlinejudge.org/external/2/p247.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA247/59eed8bd2abe0c1c58fd6b83bbb9d0a70ea1eb75.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA247/fe64af54944f39dc6b86cdd94cbc8863c611a0d9.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA247/444a24a6620e1f85b1ff6fd24dbefb01e88eeeb0.png)