UVA771 Flying Stars

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=9&page=show_problem&problem=712 [PDF](https://uva.onlinejudge.org/external/7/p771.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA771/f82dd83cca0dfdeead65a3f6584d0c0af56f48bb.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA771/4504a6a18633cb275671ec905a51ee7ce84a023f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA771/df5f3abe833f4638607b936f2fb63a60ff210ac9.png)