UVA320 Border

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=5&page=show_problem&problem=256 [PDF](https://uva.onlinejudge.org/external/3/p320.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA320/d5c89527ea9a5db1a3af5000c2a30667fbeba623.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA320/8fb1ba722d0ed5396947b44c5f8db1cede716996.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA320/936ca6358fbb2472bdc5740d33872c6c7b72a35c.png)