This repository contains my C++ solutions for various LeetCode problems, organized by category. Each entry links to the original problem, shows its difficulty, and links to the solution file. This README serves as a quick reference guide to navigate through the solutions. The solutions are categorized based on the type of problem or algorithm used. Each solution file has complete information about the problem, including the problem statement, constraints, and the implemented solution.
| Problem | Difficulty | Solution |
|---|---|---|
| 41. First Missing Positive | Hard | Solution |
| 53. Maximum Subarray | Medium | Solution |
| 56. Merge Intervals | Medium | Solution |
| 75. Sort Colors | Medium | Solution |
| 128. Longest Consecutive Sequence | Medium | Solution |
| 134. Gas Station | Medium | Solution |
| 138. Copy List with Random Pointer | Medium | Solution |
| 189. Rotate Array | Medium | Solution |
| 229. Majority Element II | Medium | Solution |
| 268. Missing Number | Easy | Solution |
| 274. H-Index | Medium | Solution |
| 287. Find the Duplicate Number | Medium | Solution |
| 324. Wiggle Sort II | Medium | Solution |
| 442. Find All Duplicates in an Array | Medium | Solution |
| 485. Max Consecutive Ones | Easy | Solution |
| 1752. Check if Array Is Sorted and Rotated | Easy | Solution |
| 2615. Sum of Distances | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 8. String to Integer (atoi) | Medium | Solution |
| 12. Integer to Roman | Medium | Solution |
| 14. Longest Common Prefix | Easy | Solution |
| 38. Count and Say | Medium | Solution |
| 49. Group Anagrams | Medium | Solution |
| 151. Reverse Words in a String | Medium | Solution |
| 205. Isomorphic Strings | Easy | Solution |
| 290. Word Pattern | Easy | Solution |
| 392. Is Subsequence | Easy | Solution |
| 443. String Compression | Medium | Solution |
| 451. Sort Characters By Frequency | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 48. Rotate Image | Medium | Solution |
| 54. Spiral Matrix | Medium | Solution |
| 59. Spiral Matrix II | Medium | Solution |
| 73. Set Matrix Zeroes | Medium | Solution |
| 74. Search a 2D Matrix | Medium | Solution |
| 867. Transpose Matrix | Easy | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 11. Container With Most Water | Medium | Solution |
| 15. 3Sum | Medium | Solution |
| 42. Trapping Rain Water | Hard | Solution |
| 80. Remove Duplicates from Sorted Array II | Medium | Solution |
| 167. Two Sum II - Input Array Is Sorted | Medium | Solution |
| 922. Sort Array By Parity II | Easy | Solution |
| 2149. Rearrange Array Elements by Sign | Medium | Solution |
| 2161. Partition Array According to Given Pivot | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 238. Product of Array Except Self | Medium | Solution |
| 304. Range Sum Query 2D - Immutable | Medium | Solution |
| 523. Continuous Subarray Sum | Medium | Solution |
| 525. Contiguous Array | Medium | Solution |
| 560. Subarray Sum Equals K | Medium | Solution |
| 724. Find Pivot Index | Easy | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 20. Valid Parentheses | Easy | Solution |
| 84. Largest Rectangle in Histogram | Hard | Solution |
| 85. Maximal Rectangle | Hard | Solution |
| 150. Evaluate Reverse Polish Notation | Medium | Solution |
| 155. Min Stack | Medium | Solution |
| 224. Basic Calculator | Hard | Solution |
| 227. Basic Calculator II | Medium | Solution |
| 239. Sliding Window Maximum | Hard | Solution |
| 402. Remove K Digits | Medium | Solution |
| 496. Next Greater Element I | Easy | Solution |
| 503. Next Greater Element II | Medium | Solution |
| 739. Daily Temperatures | Medium | Solution |
| 853. Car Fleet | Medium | Solution |
| 901. Online Stock Span | Medium | Solution |
| 907. Sum of Subarray Minimums | Medium | Solution |
| 2104. Sum of Subarray Ranges | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| Stack using Arrays | Easy | Solution |
| Queue using Arrays | Easy | Solution |
| Stack using Queue | Easy | Solution |
| Queue using Stack | Easy | Solution |
| Previous Smaller Element | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 2. Add Two Numbers | Medium | Solution |
| 19. Remove Nth Node From End of List | Medium | Solution |
| 23. Merge k Sorted Lists | Hard | Solution |
| 61. Rotate List | Medium | Solution |
| 86. Partition List | Medium | Solution |
| 92. Reverse Linked List II | Medium | Solution |
| 141. Linked List Cycle | Easy | Solution |
| 142. Linked List Cycle II | Medium | Solution |
| 143. Reorder List | Medium | Solution |
| 148. Sort List | Medium | Solution |
| 160. Intersection of Two Linked Lists | Easy | Solution |
| 206. Reverse Linked List | Easy | Solution |
| 237. Delete Node in a Linked List | Medium | Solution |
| 328. Odd Even Linked List | Medium | Solution |
| 445. Add Two Numbers II | Medium | Solution |
| 876. Middle of the Linked List | Easy | Solution |
| 2095. Delete the Middle Node of a Linked List | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 17. Letter Combinations of a Phone Number | Medium | Solution |
| 37. Sudoku Solver | Hard | Solution |
| 39. Combination Sum | Medium | Solution |
| 40. Combination Sum II | Medium | Solution |
| 46. Permutations | Medium | Solution |
| 50. Pow(x, n) | Medium | Solution |
| 90. Subsets II | Medium | Solution |
| 131. Palindrome Partitioning | Medium | Solution |
| 216. Combination Sum III | Medium | Solution |
| 1922. Count Good Numbers | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 126. Word Ladder II | Hard | Solution |
| 127. Word Ladder | Hard | Solution |
| 130. Surrounded Regions | Medium | Solution |
| 133. Clone Graph | Medium | Solution |
| 200. Number of Islands | Medium | Solution |
| 399. Evaluate Division | Medium | Solution |
| 417. Pacific Atlantic Water Flow | Medium | Solution |
| 433. Minimum Genetic Mutation | Medium | Solution |
| 542. 01 Matrix | Medium | Solution |
| 695. Max Area of Island | Medium | Solution |
| 752. Open the Lock | Medium | Solution |
| 773. Flood Fill | Easy | Solution |
| 785. Is Graph Bipartite | Medium | Solution |
| 909. Snakes and Ladders | Medium | Solution |
| 994. Rotting Oranges | Medium | Solution |
| 1020. Number of Enclaves | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 207. Course Schedule | Medium | Solution |
| 210. Course Schedule II | Medium | Solution |
| 802. Find Eventual Safe States | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 743. Network Delay Time | Medium | Solution |
| 787. Cheapest Flights Within K Stops | Medium | Solution |
| 1091. Shortest Path in Binary Matrix | Medium | Solution |
| 1334. City with the Smallest Number of Neighbors | Medium | Solution |
| 1631. Path With Minimum Effort | Medium | Solution |
| 1976. Number of Ways to Arrive at Destination | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| 547. Number of Provinces | Medium | Solution |
| 684. Redundant Connection | Medium | Solution |
| 947. Most Stones Removed with Same Row or Column | Medium | Solution |
| 1319. Operations to Make Network Connected | Medium | Solution |
| Problem | Difficulty | Solution |
|---|---|---|
| Topological Sorting - DFS | Medium | Solution |
| Topological Sorting - BFS | Medium | Solution |
| Shortest Path in DAG | Hard | Solution |
| Dijkstra's Algorithm | Medium | Solution |
| Bellmann Ford Algorithm | Medium | Solution |
| Floyd Warshall (APSP) | Medium | Solution |
| Prim's Algorithm (MST) | Medium | Solution |
| Disjoint Set (Union by Rank) | Medium | Solution |