UVA11678 Cards' Exchange

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=78&page=show_problem&problem=2725 [PDF](https://uva.onlinejudge.org/external/116/p11678.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11678/1a7caaa793b106d2d4c7e374089632828dab9c32.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11678/7ebf6fe9b09bdff28d6e0001afb39739f7f83273.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11678/e6ff15a539028340771504e6b0523a3c1bbde113.png)