UVA13091 No Ball

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=866&page=show_problem&problem=4989 [PDF](https://uva.onlinejudge.org/external/130/p13091.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13091/f175f330cc7e6f5955cb23b6bf151a8d5a16eb12.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13091/1354694ce4ac7bb223bdb79586b41625aa6b5875.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13091/5d795cca8312604a03e83773a5bbabac452dc0a4.png)