UVA849 Radar Tracking

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=790 [PDF](https://uva.onlinejudge.org/external/8/p849.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA849/503ad872fba42dd1f6d39db07884087cbf082d86.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA849/c3bd973a32a6c80dad8dbab5dace6cff6d9475df.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA849/c49f4db75d495cd1063d5f401ab992cafd91047a.png)