Question Sort By Number
| Question Number | Question | Level | Topic | Date |
|---|
| 1 | Two Sum | Easy | Hash Table | 2021-01-20 |
| 2 | Add Two Numbers | Medium | Linked List | 2021-01-21 |
| 3 | Longest Substring Without Repeating Characters | Medium | Two Pointers | 2021-01-22 |
| 4 | Median of Two Sorted Arrays | Hard | Binary Search | 2021-01-23 |
| 5 | Longest Palindromic Substring | Medium | DP | 2021-01-24 |
| 21 | Merge Two Sorted Lists | Easy | Linked List | 2020-10-13 |
| 39 | Combination Sum | Medium | Backtracking | 2020-10-04 |
| 46 | Permutations | Medium | Backtracking | 2021-04-29 |
| 53 | Maximum Subarray | Easy | DP | 2020-05-15 |
| 61 | Rotate List | Medium | Linked List | 2020-10-07 |
| 72 | Edit Distance | Hard | DP | 2020-05-31 |
| 121 | Best Time to Buy and Sell Stock | Easy | DP | 2020-05-16 |
| 136 | Single Number | Easy | Bit Manipulation | 2020-05-29 |
| 137 | Single Number II | Medium | Bit Manipulation | 2020-05-29 |
| 148 | Sort List | Medium | Linked List | 2020-09-30 |
| 170 | Two Sum III - Data structure design | Easy | Hash Table | 2020-10-02 |
| 190 | Reverse Bits | Easy | Bit Manipulation | 2020-05-28 |
| 191 | Number of 1 Bits | Easy | Bit Manipulation | 2020-05-28 |
| 198 | House Robber | Easy | DP | 2020-09-29 |
| 207 | Course Schedule | Medium | Topological Sort | 2020-05-29 |
| 208 | Implement Trie (Prefix Tree) | Medium | Trie | 2020-05-14 |
| 213 | House Robber II | Medium | DP | 2020-10-14 |
| 221 | Maximal Square | Medium | DP | 2020-05-21 |
| 226 | Invert Binary Tree | Easy | Tree | 2020-06-01 |
| 230 | Kth Smallest Element in a BST | Medium | Binary Search | 2020-05-20 |
| 231 | Power of Two | Easy | Bit Manipulation | 2020-05-28 |
| 237 | Delete Node in a Linked List | Easy | Linked List | 2020-06-02 |
| 252 | Meeting Rooms | Easy | Greedy | 2020-10-31 |
| 253 | Meeting Rooms II | Medium | Greedy | 2020-10-30 |
| 260 | Single Number III | Medium | Bit Manipulation | 2020-05-30 |
| 266 | Palindrome Permutation | Easy | Hash Table | 2020-05-24 |
| 316 | Remove Duplicate Letters | Medium | Greedy | 2020-10-09 |
| 325 | Maximum Size Subarray Sum Equals k | Medium | Hash Table | 2020-05-26 |
| 328 | Odd Even Linked List | Medium | Linked List | 2020-05-16 |
| 338 | Counting Bits | Medium | Bit Manipulation | 2020-05-28 |
| 344 | Reverse String | Easy | Two Pointers | 2020-06-04 |
| 402 | Remove K Digits | Medium | Stack | 2020-05-13 |
| 406 | Queue Reconstruction by Height | Medium | Greedy | 2020-06-06 |
| 438 | Find All Anagrams in a String | Medium | Hash Table | 2020-05-17 |
| 449 | Serialize and Deserialize BST | Medium | Tree | 2020-10-11 |
| 451 | Sort Characters By Frequency | Medium | Hash Table | 2020-05-22 |
| 452 | Minimum Number of Arrows to Burst Balloons | Medium | Greedy | 2020-10-01 |
| 476 | Number Complement | Easy | Bit Manipulation | 2020-10-03 |
| 518 | Coin Change 2 | Medium | DP | 2020-06-07 |
| 525 | Contiguous Array | Medium | Hash Table | 2020-05-26 |
| 528 | Random Pick with Weight | Medium | Binary Search | 2020-06-05 |
| 540 | Single Element in a Sorted Array | Medium | Binary Search | 2020-05-12 |
| 567 | Permutation in String | Medium | Hash Table | 2020-05-18 |
| 701 | Insert into a Binary Search Tree | Medium | Tree | 2020-10-06 |
| 704 | Binary Search | Easy | Binary Search | 2020-10-08 |
| 785 | Is Graph Bipartite? | Medium | Graph | 2020-05-27 |
| 859 | Buddy Strings | Easy | String | 2020-10-12 |
| 886 | Possible Bipartition | Medium | Graph | 2020-05-27 |
| 901 | Online Stock Span | Medium | Stack | 2020-05-19 |
| 918 | Maximum Sum Circular Subarray | Medium | Array | 2020-05-15 |
| 949 | Largest Time for Given Digits | Easy | Math | 2020-09-01 |
| 965 | Univalued Binary Tree | Easy | Tree | 2020-06-02 |
| 973 | K Closest Points to Origin | Medium | Sort | 2020-05-30 |
| 986 | Interval List Intersections | Medium | Two Pointers | 2020-05-23 |
| 1008 | Construct Binary Search Tree from Preorder Traversal | Medium | Tree | 2020-05-24 |
| 1009 | Complement of Base 10 Integer | Easy | Bit Manipulation | 2020-10-05 |
| 1029 | Two City Scheduling | Easy | Greedy | 2020-06-03 |
| 1035 | Uncrossed Lines | Medium | DP | 2020-05-25 |
| 1081 | Smallest Subsequence of Distinct Characters | Medium | Greedy | 2020-10-10 |
| 1143 | Longest Common Subsequence | Medium | DP | 2020-05-25 |
| 1277 | Count Square Submatrices with All Ones | Medium | DP | 2020-05-21 |
| 1290 | Convert Binary Number in a Linked List to Integer | Easy | Bit Manipulation | 2020-11-01 |
| 1450 | Number of Students Doing Homework at a Given Time | Easy | Array | 2020-05-16 |
| 1451 | Rearrange Words in a Sentence | Medium | String | 2020-05-16 |
| 1452 | People Whose List of Favorite Companies Is Not a Subset of Another List | Medium | String | 2020-05-16 |
| 1455 | Check If a Word Occurs As a Prefix of Any Word in a Sentence | Easy | String | 2020-05-23 |
| 1456 | Maximum Number of Vowels in a Substring of Given Length | Medium | Sliding Window | 2020-05-23 |
| 1457 | Pseudo-Palindromic Paths in a Binary Tree | Medium | Tree | 2020-05-23 |
| 1458 | Max Dot Product of Two Subsequences | Hard | DP | 2020-05-23 |
| 1464 | Maximum Product of Two Elements in an Array | Easy | Array | 2020-05-31 |
| 1465 | Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts | Medium | Array | 2020-05-31 |
| 1466 | Reorder Routes to Make All Paths Lead to the City Zero | Medium | Tree | 2020-05-31 |
| 1470 | Shuffle the Array | Easy | Array | 2020-06-06 |
| 1471 | The k Strongest Values in an Array | Medium | Array | 2020-06-06 |
| 1472 | Design Browser History | Medium | Design | 2020-06-06 |
| 1616 | Split Two Strings to Make Palindrome | Medium | Greedy | 2020-10-13 |