题目：
https://www.luogu.com.cn/problem/T446622
by wanttoac @ 2024-04-20 00:57:44
@[wanttoac](/user/1258100) 枚举显然不可能了，枚举子集是 $O(n^2)$ 的，Hard Version有原题，[this](https://www.luogu.com.cn/problem/P4062)
by Li_Yichen @ 2024-04-20 06:51:12
@[wanttoac](/user/1258100) 整体的思想是不变的，判断条件变了一点
by Li_Yichen @ 2024-04-20 06:52:10