| 2. Add Two Numbers | Solution | Solve | Medium | | |
| 3. Longest Substring Without Repeating Characters | Solution | Solve | Medium | | |
| 9. Palindrome Number | Solution | Solve | Easy | | |
| 11. Container With Most Water | Solution | Solve | Medium | | |
| 17. Letter Combinations of a Phone Number | Solution | Solve | Medium | | |
| 20. Valid Parentheses | Solution | Solve | Easy | | |
| 48. Rotate Image | Solution | Solve | Medium | | |
| 54. Spiral Matrix | Solution | Solve | Medium | | |
| 56. Merge Intervals | Solution | Solve | Medium | | |
| 68. Text Justification | Solution | Solve | Hard | | |
| 71. Simplify Path | Solution | Solve | Medium | | |
| 84. Largest Rectangle in Histogram | Solution | Solve | Hard | | |
| 121. Best Time to Buy and Sell Stock | Solution | Solve | Easy | | |
| 122. Best Time to Buy and Sell Stock II | Solution | Solve | Medium | | |
| 127. Word Ladder | Solution | Solve | Hard | | |
| 146. LRU Cache | Solution | Solve | Medium | | |
| 200. Number of Islands | Solution | Solve | Medium | | |
| 253. Meeting Rooms II | Solution | Solve | Medium | | |
| 257. Binary Tree Paths | Solution | Solve | Easy | | |
| 322. Coin Change | Solution | Solve | Medium | | |
| 332. Reconstruct Itinerary | Solution | Solve | Hard | | |
| 415. Add Strings | Solution | Solve | Easy | | |
| 435. Non-overlapping Intervals | Solution | Solve | Medium | | |
| 539. Minimum Time Difference | Solution | Solve | Medium | | |
| 546. Remove Boxes | Solution | Solve | Hard | | |
| 560. Subarray Sum Equals K | Solution | Solve | Medium | | |
| 647. Palindromic Substrings | Solution | Solve | Medium | | |
| 723. Candy Crush | Solution | Solve | Medium | | |
| 733. Flood Fill | Solution | Solve | Easy | | |
| 896. Monotonic Array | Solution | Solve | Easy | | |
| 992. Subarrays with K Different Integers | Solution | Solve | Hard | | |
| 1052. Grumpy Bookstore Owner | Solution | Solve | Medium | | |
| 1166. Design File System | Solution | Solve | Medium | | |
| 1390. Four Divisors | Solution | Solve | Medium | | |
| 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Solution | Solve | Medium | | |
| 1743. Restore the Array From Adjacent Pairs | Solution | Solve | Medium | | |
| 1814. Count Nice Pairs in an Array | Solution | Solve | Medium | | |
| 1861. Rotating the Box | Solution | Solve | Medium | | |
| 2021. Brightest Position on Street | Solution | Solve | Medium | | |
| 2023. Number of Pairs of Strings With Concatenation Equal to Target | Solution | Solve | Medium | | |
| 2043. Simple Bank System | Solution | Solve | Medium | | |
| 2141. Maximum Running Time of N Computers | Solution | Solve | Hard | | |
| 2169. Count Operations to Obtain Zero | Solution | Solve | Easy | | |
| 2251. Number of Flowers in Full Bloom | Solution | Solve | Hard | | |
| 2502. Design Memory Allocator | Solution | Solve | Medium | | |
| 2544. Alternating Digit Sum | Solution | Solve | Easy | | |
| 2672. Number of Adjacent Elements With the Same Color | Solution | Solve | Medium | | |
| 2768. Number of Black Blocks | Solution | Solve | Medium | | |
| 2817. Minimum Absolute Difference Between Elements With Constraint | Solution | Solve | Medium | | |
| 3019. Number of Changing Keys | Solution | Solve | Easy | | |
