UVA12026 Radars

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=242&page=show_problem&problem=3177 [PDF](https://uva.onlinejudge.org/external/120/p12026.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12026/99527d7938af3afe874847354b1434599913b9ba.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12026/7ae81fe2d53096dd0bc6b3a72af461cba7500e46.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12026/14845f2f0b03b823c82e54284fbad62e82269ba3.png)