| 1. Two Sum | Solution | Solve | Easy | | |
| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | | |
| 11. Container With Most Water | Solution | Solve | Medium | | |
| 13. Roman to Integer | Solution | Solve | Easy | | |
| 17. Letter Combinations of a Phone Number | Solution | Solve | Medium | | |
| 20. Valid Parentheses | Solution | Solve | Easy | | |
| 22. Generate Parentheses | Solution | Solve | Medium | | |
| 28. Find the Index of the First Occurrence in a String | Solution | Solve | Easy | | |
| 38. Count and Say | Solution | Solve | Medium | | |
| 42. Trapping Rain Water | Solution | Solve | Hard | | |
| 49. Group Anagrams | Solution | Solve | Medium | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 73. Set Matrix Zeroes | Solution | Solve | Medium | | |
| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 127. Word Ladder | Solution | Solve | Hard | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 198. House Robber | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 230. Kth Smallest Element in a BST | Solution | Solve | Medium | | |
| 239. Sliding Window Maximum | Solution | Solve | Hard | | |
| 255. Verify Preorder Sequence in Binary Search Tree | Solution | Solve | Medium | | |
| 316. Remove Duplicate Letters | Solution | Solve | Medium | | |
| 443. String Compression | Solution | Solve | Medium | | |
| 611. Valid Triangle Number | Solution | Solve | Medium | | |
| 697. Degree of an Array | Solution | Solve | Easy | | |
| 724. Find Pivot Index | Solution | Solve | Easy | | |
| 767. Reorganize String | Solution | Solve | Medium | | |
| 787. Cheapest Flights Within K Stops | Solution | Solve | Medium | | |
| 926. Flip String to Monotone Increasing | Solution | Solve | Medium | | |
| 994. Rotting Oranges | Solution | Solve | Medium | | |
| 1004. Max Consecutive Ones III | Solution | Solve | Medium | | |
| 1101. The Earliest Moment When Everyone Become Friends | Solution | Solve | Medium | | |
| 1151. Minimum Swaps to Group All 1's Together | Solution | Solve | Medium | | |
| 1283. Find the Smallest Divisor Given a Threshold | Solution | Solve | Medium | | |
| 1328. Break a Palindrome | Solution | Solve | Medium | | |
| 1413. Minimum Value to Get Positive Step by Step Sum | Solution | Solve | Easy | | |
| 1423. Maximum Points You Can Obtain from Cards | Solution | Solve | Medium | | |
| 1451. Rearrange Words in a Sentence | Solution | Solve | Medium | | |
| 1481. Least Number of Unique Integers after K Removals | Solution | Solve | Medium | | |
| 1492. The kth Factor of n | Solution | Solve | Medium | | |
| 1560. Most Visited Sector in a Circular Track | Solution | Solve | Easy | | |
| 1611. Minimum One Bit Operations to Make Integers Zero | Solution | Solve | Hard | | |
| 1944. Number of Visible People in a Queue | Solution | Solve | Hard | | |
| 1962. Remove Stones to Minimize the Total | Solution | Solve | Medium | | |
| 1963. Minimum Number of Swaps to Make the String Balanced | Solution | Solve | Medium | | |
| 2006. Count Number of Pairs With Absolute Difference K | Solution | Solve | Easy | | |
| 2062. Count Vowel Substrings of a String | Solution | Solve | Easy | | |
| 2168. Unique Substrings With Equal Digit Frequency | Solution | Solve | Medium | | |
| 2366. Minimum Replacements to Sort the Array | Solution | Solve | Hard | | |
| 2491. Divide Players Into Teams of Equal Skill | Solution | Solve | Medium | | |
