UVA679 小球下落 Dropping Balls

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=8&page=show_problem&problem=620 [PDF](https://uva.onlinejudge.org/external/6/p679.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA679/33ff9a6a376ef23a02cac239ea40d2476528ece5.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA679/19c056e6723f025bc2c8927b0f6f49529ecbe932.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA679/aee1382fffad1e19ed1f5b7733d49616412266c5.png)