UVA815 洪水！ Flooded!

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=756 [PDF](https://uva.onlinejudge.org/external/8/p815.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA815/74a09d41279a931ad13cf3bd880ed5c4da1a9883.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA815/77557d097803e4e8c76eb7afcda899d83f3ef1c8.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA815/23372cf780b1f4c37db59074c6fc0aafaa60f172.png)