UVA11214 守卫键盘 Guarding the Chessboard

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=2155 [PDF](https://uva.onlinejudge.org/external/112/p11214.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11214/b944da1eec66e12583384f5364ec48727533152a.png)

Input Format

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Output Format

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