UVA11231 Black and white painting

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=2172 [PDF](https://uva.onlinejudge.org/external/112/p11231.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11231/126c98f9b7a0edccff853bc51caa856bf9abde42.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11231/8b9bf69da2fecb7e16adede4d82375eada930643.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11231/c4e312228afc08d90a8c662d3ddc3a4b09422bf5.png)