| # | Title | Solution | Difficulty |
|---|---|---|---|
| 0001 | Two Sum | Java | Easy |
| 0002 | Add Two Numbers | Java | Medium |
| 0003 | Longest Substring Without Repeating Characters | Java | Medium |
| 0021 | Merge Two Sorted Lists | Java | Easy |
| 0075 | Sort Colors | Java | Medium |
| 0078 | Subsets | Java | Medium |
| 0090 | Subsets II | Java | Medium |
| 0091 | Decode Ways | Java | Medium |
| 0101 | Symmetric Tree | Java | Easy |
| 0102 | Binary Tree Level Order Traversal | Java | Medium |
| 0104 | Maximum Depth of Binary Tree | Java | Easy |
| 0218 | The Skyline Problem | Java | Hard |
| 0222 | Count Complete Tree Nodes | Java | Medium |
| 0224 | Basic Calculator | Java | Hard |
| 0239 | Sliding Window Maximum | Java | Hard |
| 0739 | Daily Temperatures | Java | Medium |
| 0953 | Verifying an Alien Dictionary | Java | Easy |
| 0993 | Cousins in Binary Tree | Java | Easy |
| 0994 | Rotting Oranges | Java | Easy |
| 1333 | Filter Restaurants | Java | Medium |
| 1343 | Mean of the Sub-arrays of size k | Java | Medium |
| 1344 | Jump Game V | Java | Hard |