| 1. Two Sum | | | Solve | Easy | | |
| 3. Longest Substring Without Repeating Characters | | | Solve | Medium | | |
| 4. Median of Two Sorted Arrays | | | Solve | Hard | | |
| 6. Zigzag Conversion | | | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | | | Solve | Medium | | |
| 42. Trapping Rain Water | | | Solve | Hard | | |
| 50. Pow(x, n) | | | Solve | Medium | | |
| 92. Reverse Linked List II | | | Solve | Medium | | |
| 121. Best Time to Buy and Sell Stock | | | Solve | Easy | | |
| 141. Linked List Cycle | | | Solve | Easy | 42gearMobilitySystems+131 | |
| 146. LRU Cache | | | Solve | Medium | | |
| 200. Number of Islands | | | Solve | Medium | | |
| 202. Happy Number | | | Solve | Easy | | |
| 215. Kth Largest Element in an Array | | | Solve | Medium | | |
| 225. Implement Stack using Queues | | | Solve | Easy | | |
| 239. Sliding Window Maximum | | | Solve | Hard | | |
| 287. Find the Duplicate Number | | | Solve | Medium | | |
| 295. Find Median from Data Stream | | | Solve | Hard | | |
| 300. Longest Increasing Subsequence | | | Solve | Medium | | |
| 403. Frog Jump | | | Solve | Hard | | |
| 557. Reverse Words in a String III | | | Solve | Easy | | |
| 706. Design HashMap | | | Solve | Easy | | |
| 767. Reorganize String | | | Solve | Medium | | |
| 839. Similar String Groups | | | Solve | Hard | | |
| 851. Loud and Rich | | | Solve | Medium | | |
| 864. Shortest Path to Get All Keys | | | Solve | Hard | | |
| 977. Squares of a Sorted Array | | | Solve | Easy | | |
| 1155. Number of Dice Rolls With Target Sum | | | Solve | Medium | | |
| 1161. Maximum Level Sum of a Binary Tree | | | Solve | Medium | | |
| 1190. Reverse Substrings Between Each Pair of Parentheses | | | Solve | Medium | | |
| 1229. Meeting Scheduler | | | Solve | Medium | | |
| 1328. Break a Palindrome | | | Solve | Medium | | |
| 1473. Paint House III | | | Solve | Hard | | |
| 1589. Maximum Sum Obtained of Any Permutation | | | Solve | Medium | | |
| 1647. Minimum Deletions to Make Character Frequencies Unique | | | Solve | Medium | | |
| 1882. Process Tasks Using Servers | | | Solve | Medium | | |
| 1969. Minimum Non-Zero Product of the Array Elements | | | Solve | Medium | | |
| 1999. Smallest Greater Multiple Made of Two Digits | | | Solve | Medium | | |
| 2056. Number of Valid Move Combinations On Chessboard | | | Solve | Hard | | |
| 2183. Count Array Pairs Divisible by K | | | Solve | Hard | | |
| 2380. Time Needed to Rearrange a Binary String | | | Solve | Medium | | |
| 2385. Amount of Time for Binary Tree to Be Infected | | | Solve | Medium | | |
| 2402. Meeting Rooms III | | | Solve | Hard | | |
| 2524. Maximum Frequency Score of a Subarray | | | Solve | Hard | | |
| 2554. Maximum Number of Integers to Choose From a Range I | | | Solve | Medium | | |
| 2557. Maximum Number of Integers to Choose From a Range II | | | Solve | Medium | | |
| 2559. Count Vowel Strings in Ranges | | | Solve | Medium | | |
| 2586. Count the Number of Vowel Strings in Range | | | Solve | Easy | | |
