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更新 0090.子集II 排版格式更新

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<img src="../pics/训练营.png" width="1000"/>
</a>
<p align="center"><strong><a href="https://mp.weixin.qq.com/s/tqCxrMEU-ajQumL1i8im9A">参与本项目</a>，贡献其他语言版本的代码，拥抱开源，让更多学习算法的小伙伴们收益！</strong></p>
# 90.子集II
[力扣题目链接](https://leetcode.cn/problems/subsets-ii/)
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[]
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# 算法公开课
## 算法公开课
**《代码随想录》算法视频公开课：[回溯算法解决子集问题，如何去重？| LeetCode：90.子集II](https://www.bilibili.com/video/BV1vm4y1F71J/)，相信结合视频再看本篇题解，更有助于大家对本题的理解**。
**[《代码随想录》算法视频公开课](https://programmercarl.com/other/gongkaike.html)：[回溯算法解决子集问题，如何去重？| LeetCode：90.子集II](https://www.bilibili.com/video/BV1vm4y1F71J/)，相信结合视频再看本篇题解，更有助于大家对本题的理解**。
## 思路
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#### Python3
### Python3
回溯 利用used数组去重
```python
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<a href="https://programmercarl.com/other/kstar.html" target="_blank">
<img src="../pics/网站星球宣传海报.jpg" width="1000"/>
</a>