| # | Title | Solution | Difficulty |
|---|---|---|---|
| 1 | Two Sum | java | Easy |
| 2 | Add Two Numbers | java | Medium |
| 3 | Longest Substring Without Repeating... | java | Medium |
| 4 | Median of Two Sorted Arrays | java | Hard |
| 5 | Longest Palindromic Substring | java | Medium |
| 7 | Reverse Integer | java | Easy |
| 9 | Palindrome Number | java | Easy |
| 13 | Roman to Integer | java | Easy |
| 14 | Longest Common Prefix | java | Easy |
| 20 | Valid Parentheses | java | Easy |
| 21 | Merge Two Sorted Lists | java | Easy |
| 26 | Remove Duplicates from Sorted Array | java | Easy |
| 27 | Remove Element | java | Easy |
| 42 | Trapping Rain Water | java | Hard |
| 89 | Gray Code | java | Medium |
| 205 | Isomorphic Strings | java | Easy |
| 378 | Kth Smallest Element in a Sorted Matrix | java | Medium |
| 718 | Maximum Length of Repeated Subarray | java | Medium |
| 1047 | Remove All Adjacent Duplicates In String | java | Easy |
| 1338 | Reduce Array Size to The Half | java | Medium |
| 1880 | Check if Word Equals Summation of Two Words | java | Easy |