UVA12881 Ricochet Robots

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=861&page=show_problem&problem=4746 [PDF](https://uva.onlinejudge.org/external/128/p12881.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12881/ea3435ff45da9dd1a721786ceb03d178c0d1f2d3.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12881/4a8a461b5167b63d6b2597071a36ad376cb75dbc.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12881/d7e439f2dcd042e6e88b557b12a1b051781ae02e.png)