| # | Title | Todo | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|---|
| 1 | Python3 Basic Grammar 0001 | Todo File | Answer | Easy | Youtube | Bilibili | Xigua |
| 2 | Python3 List 0002 | Todo File | Answer | Easy | Youtube | Bilibili | Xigua |
| 3 | 1. Two Sum | Todo File | Answer | Easy | Youtube | Bilibili | Xigua |
| 4 | Python3 Dictionary 0004 | Todo File | Answer | Easy | Youtube | Bilibili | Xigua |
| 5 | Python3 Set 0005 | Todo File | Answer | Easy | Youtube | Bilibili | Xigua |
| 6 | 242. Valid Anagram 0006 | Todo File | Answer | Easy | Youtube | Bilibili | Xigua |
| 7 | 49. Group Anagrams 0007 | Todo File | Answer | Medium | Youtube | Bilibili | Xigua |
| 8 | 347. Top K Frequent 0008 | Todo File | Answer | Medium | Youtube | Bilibili | Xigua |
| 9 | 238. Product of Array 0009 | Todo File | Answer | Medium | Youtube | Bilibili | Xigua |
| 10 | 36. Valid Sudoku 0010 | Todo File | Answer | Medium | Youtube | Bilibili | Xigua |
| 11 | 128. Longest Consecutive 0011 | Todo File | Answer | Medium | Youtube | Bilibili | Xigua |
| 12 | Python3 Review1 0012 | Todo File | Answer | -- | Youtube | Bilibili | Xigua |
- Search the exact index/element.
- Search the first/last index/element.
- Search with complex conditions.
- Binary search the result range with a complex verification function
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 13 | Binary Search py3 0013 | Todo File/Answer | Easy | Youtube | Bilibili | Xigua |
| 14 | 35 & 74 | Answer | Easy | Youtube | Bilibili | Xigua |
| 15 | 240 & 852 | Answer | Easy | Youtube | Bilibili | Xigua |
| 16 | 34 & 278 | Answer | Easy | Youtube | Bilibili | Xigua |
| 17 | 153 & 33 | Answer | Medium | Youtube | Bilibili | Xigua |
| 18 | 875. Koko 0018 | Answer | Medium | Youtube | Bilibili | Xigua |
| 20 | 668. Kth Smallest 0020 | Answer | Medium | Youtube | Bilibili | Xigua |
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 21 | python3 Stack 0021 | Todo File / Answer | Easy | Youtube | Bilibili | Xigua |
| 22 | 20 & 1249 | Answer | Easy | Youtube | Bilibili | Xigua |
| 23 | 155 & 150 | Answer | Medium | Youtube | Bilibili | Xigua |
| 24 | 739 | Answer | Medium | Youtube | Bilibili | Xigua |
| 25 | 22. | Answer | Medium+ | Youtube | Bilibili | Xigua |
| 26 | 853. | Answer | Medium+ | Youtube | Bilibili | Xigua |
- Preorder/Inorder/Postorder traversal (and construct)
- Data Structure
- DFS
- BFS level order traversal
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 27 | 94 & 144 & 145 | Answer | Easy | Youtube | Bilibili | Xigua |
| 28 | 226 & 100 & 104 & 110 & 543 & 572 | Answer | Easy | Youtube | Bilibili | Xigua |
| 29 | 235 & 102 & 199 | Answer | Medium | Youtube | Bilibili | Xigua |
| 30 | 98 & 1448 & 230 | Answer | Medium | Youtube | Bilibili | Xigua |
| 31 | 105. 创建二叉树 0031 | Answer | Medium | Youtube | Bilibili | Xigua |
| 32 | 二叉树序列化与反序列化 | Answer | Medium | Youtube | Bilibili | Xigua |
| 33 | 叉树先序遍历 | Answer | Easy | Youtube | Bilibili | Xigua |
| 59 | 随缘应聘讲师，随缘招生 | Q:1038 & 1382 A:1038 & 1382 | Medium | Youtube | Bilibili | Xigua |
- BFS in Tree
- BFS in Graph / (Typological Sorting)
- BFS in Matrix
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 34 | [Python3 双端队列] | Answer | Easy | Youtube | Bilibili | Xigua |
| 35 | 107 & 1022 | Answer | Easy | Youtube | Bilibili | Xigua |
| 36 | 662 & 987 | Answer | Medium+ | Youtube | Bilibili | Xigua |
| 37 | 863 | Answer | Medium+ | Youtube | Bilibili | Xigua |
| 38 | 133 | Answer | Medium | Youtube | Bilibili | Xigua |
| 39 | 127 | Answer | Medium | Youtube | Bilibili | Xigua |
| 40 | 126 | Answer | Hard+ | Youtube | Bilibili | Xigua |
| 41 | 210 | Answer | Medium | Youtube | Bilibili | Xigua |
| 42 | PriorityQueue & 743 | Answer | Medium | Youtube | Bilibili | Xigua |
| 43 | 1129 | Answer | Medium | Youtube | Bilibili | Xigua |
| 44 | 1311 | Answer | Medium | Youtube | Bilibili | Xigua |
| 45 | 200 | Answer | Medium | Youtube | Bilibili | Xigua |
| 46 | 994 | Answer | Medium | Youtube | Bilibili | Xigua |
| 47 | 529 | Answer | Medium | Youtube | Bilibili | Xigua |
| 48 | 752 & 1293 | Answer | Medium+ | Youtube | Bilibili | Xigua |
| 60 | Typological Sorting 拓扑排序 | Answer | Medium | Youtube | Bilibili | Xigua |
- Permutation
- Combination & Backtracking
- Graph (Tree/Matrix)
- Union find
- Other
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 49 | 78 & 90 | Answer | Medium | Youtube | Bilibili | Xigua |
| 50 | 797 | Answer | Medium | Youtube | Bilibili | Xigua |
| 51 | 980 | Answer | Hard | Youtube | Bilibili | Xigua |
| 52 | 51 | Answer | Hard | Youtube | Bilibili | Xigua |
| 53 | 37 sudoku | Answer | Hard | Youtube | Bilibili | Xigua |
| 54 | 97 dp dfs | Answer | Medium+ | Youtube | Bilibili | Xigua |
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 55 | 509_fibonacci | Answer | Easy | Youtube | Bilibili | Xigua |
| 56 | 688 | Answer | Medium | Youtube | Bilibili | Xigua |
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 57 | Path Sum 112 & 113 & 437 | Answer | Medium | Youtube | Bilibili | Xigua |
| 58 | Unique Paths 62 & 63 & 64 & 980 | Answer | Medium | Youtube | Bilibili | Xigua |
| 61 | 唠叨+排序 | Answer | Medium | Youtube | Bilibili | Xigua |
| 62 | Dijkstra BFSPQ 743 & 1334 & 2976 | Answer | Medium | Youtube | Bilibili | Xigua |
| # | Title | Answer | Difficulty | Youtube | Bilibili | Ixiagua |
|---|---|---|---|---|---|---|
| 19 | 378. Kth Smallest 0019 | Answer | Medium | Youtube | Bilibili | Xigua |