UVA11031 Looking for a Subset

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=22&page=show_problem&problem=1972 [PDF](https://uva.onlinejudge.org/external/110/p11031.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11031/101b87b6654a923309193c6690ac210580aac43e.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11031/bc4b08e578a0ea80d67152786abf6ed839c2488d.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11031/ec9cde9ad95d233c028e3def347667924578878b.png)