I am maintaining this document to track my problem-solving progress, which will help with revision and improvement over time.
| # | Question | Question Link | Complexity | Notes | Topic Name |
|---|---|---|---|---|---|
| 1 | Two Sum | LeetCode #1 | O(n) | Used HashMap for optimization | Two-Pointer |
| 2 | Add Two Numbers | LeetCode #2 | O(n) | Linked List manipulation | Two-Pointer |
| 3 | Sort 0s, 1s (Dutch National Flag Algorithm) | - | O(n) | Used two-pointer approach | Two-Pointer |
| 4 | Sort Odd and Even Numbers | - | O(n) | Partitioned array into odd and even | Two-Pointer |
| 5 | Two Sum in Sorted Array | - | O(n) | Used two-pointer approach | Two-Pointer |
| 6 | Three Sum | - | O(n^2) | Used sorting and two-pointer approach | Two-Pointer |
| 7 | Container with Most Water | - | O(n) | Maximized area using two pointers | Two-Pointer |
| 8 | Reverse an Array | - | O(n) | Swapped elements using two-pointer technique | Two-Pointer |
| 9 | Palindrome Check | - | O(n) | Compared characters from both ends | Two-Pointer |
| 10 | Find Pairs with a Given Difference | - | O(n) | Used HashSet to store values | Two-Pointer |
| 11 | Count Unique Pairs with a Given Difference (K-diff pairs) | - | O(n) | Used HashSet to find unique pairs | Two-Pointer |