UVA11957 Checkers

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=229&page=show_problem&problem=3108 [PDF](https://uva.onlinejudge.org/external/119/p11957.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11957/4868154cdaed2d4ab6394d32d9858874209e5b3c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11957/188ab14ad72df989506f627e395509ac3ec2b7ce.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11957/d55edc2288457848841747763754803afe5d6330.png)