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# [90. Subsets II](https://leetcode.com/problems/subsets-ii/)
## 题目
Given a collection of integers that might contain duplicates, ***nums***, return all possible subsets (the power set).
**Note:** The solution set must not contain duplicate subsets.
**Example:**
Input: [1,2,2]
Output:
[
[2],
[1],
[1,2,2],
[2,2],
[1,2],
[]
]
## 题目大意
给定一个可能包含重复元素的整数数组 nums返回该数组所有可能的子集幂集。说明解集不能包含重复的子集。
## 解题思路
- 这一题是第 78 题的加强版,比第 78 题多了一个条件,数组中的数字会出现重复。
- 解题方法依旧是 DFS需要在回溯的过程中加上一些判断。
- 这一题和第 78 题,第 491 题类似,可以一起解答和复习。