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26 changes: 26 additions & 0 deletions 紀錄/LeetCode 讀書會第 20 次聚會 2021_01_26.md
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# LeetCode 讀書會第 20 次聚會 2021/01/26

leetcode 讀書會通知
1. 項目: 第 20 次聚會
2. 目的: 線上一起寫題目, 由有想法的人帶領, 先解題, 再看該題有趣的解法
3. 時間: 1/26 (二) 20:00 ~ 21:00
4. 地點: google meet 線上 (前 10 分鐘預備鏈接)
5. 解題項目: [Linked list - Doubly linked list](https://leetcode.com/explore/learn/card/linked-list/210/doubly-linked-list/)

```text
### Doubly Linked list
1. Medium 707. Design Linked List
### Conclusion
1. Easy 21. Merge Two Sorted Lists
2. Medium 2. Add Two Numbers
3. Medium 430. Flatten a Multilevel Doubly Linked
> List Hint: Try to solve this problem recursively.
4. Medium 708. Insert into a Cyclic Sorted List
> Hint: A cyclic list here is a linked list that the last node is linked with the first node and form a cycle. Find out the smallest node will help you determine the suitable position.
5. Medium 138. Copy List with Random Pointer
> Hint: Using a hash set maybe is a good idea. Refer to our hash table card if you are not familiar with the hash set.
6. Medium 61. Rotate List
```
6. 共筆: GitHub https://github.com/programmingbookclub/Leetcode-club