UVA10203 Snow Clearing

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=14&page=show_problem&problem=1144 [PDF](https://uva.onlinejudge.org/external/102/p10203.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10203/3aa9eb532d00ab38b9f302ddde955d5df95e8eb7.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10203/5afb368ba721a56b1a938e9fa3db8e5f7970518a.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10203/5dfc110aeb3affb14525cad2e358b17ec4c874dd.png)