| 1. | Two Sum | https://leetcode.com/problems/two-sum | Click |
| 2. | Longest Palindromic Substring | https://leetcode.com/problems/longest-palindromic-substring | Click |
| 3. | 3Sum | https://leetcode.com/problems/3sum | Click |
| 4. | Merge Two Sorted Lists | https://leetcode.com/problems/merge-two-sorted-lists | Click |
| 5. | Merge k Sorted Lists | https://leetcode.com/problems/merge-k-sorted-lists | Click |
| 6. | Trapping Rain Water | https://leetcode.com/problems/trapping-rain-water | Click |
| 7. | Group Anagrams | https://leetcode.com/problems/group-anagrams | Click |
| 8. | Maximum Subarray | https://leetcode.com/problems/maximum-subarray | Click |
| 9. | Word Search | https://leetcode.com/problems/word-search | Click |
| 10. | Binary Tree Zigzag Level Order Traversal | https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal | Click |
| 11. | Best Time to Buy and Sell Stock | https://leetcode.com/problems/best-time-to-buy-and-sell-stock | Click |
| 12. | Word Ladder II | https://leetcode.com/problems/word-ladder-ii | |
| 13. | Word Ladder | https://leetcode.com/problems/word-ladder | |
| 14. | Copy List with Random Pointer | https://leetcode.com/problems/copy-list-with-random-pointer | Click |
| 15. | Word Break | https://leetcode.com/problems/word-break | Click |
| 16. | Word Break II | https://leetcode.com/problems/word-break-ii | Click |
| 17. | LRU Cache | https://leetcode.com/problems/lru-cache | Click |
| 18. | Min Stack | https://leetcode.com/problems/min-stack | Click |
| 19. | Number of Islands | https://leetcode.com/problems/number-of-islands | Click |
| 20. | Course Schedule II | https://leetcode.com/problems/course-schedule-ii | Click |
| 21. | Word Search II | https://leetcode.com/problems/word-search-ii | Click |
| 22. | Basic Calculator II | https://leetcode.com/problems/basic-calculator-ii | |
| 23. | Sliding Window Maximum | https://leetcode.com/problems/sliding-window-maximum | Click |
| 24. | Search a 2D Matrix II | https://leetcode.com/problems/search-a-2d-matrix-ii | |
| 25. | Meeting Rooms II | https://leetcode.com/problems/meeting-rooms-ii | |
| 26. | Alien Dictionary | https://leetcode.com/problems/alien-dictionary | |
| 27. | Integer to English Words | https://leetcode.com/problems/integer-to-english-words | |
| 28. | Find Median from Data Stream | https://leetcode.com/problems/find-median-from-data-stream | Click |
| 29. | Serialize and Deserialize Binary Tree | https://leetcode.com/problems/serialize-and-deserialize-binary-tree | Click |
| 30. | Design Snake Game | https://leetcode.com/problems/design-snake-game | |
| 31. | Insert Delete GetRandom O 1 | https://leetcode.com/problems/insert-delete-getrandom-o1 | |
| 32. | LFU Cache | https://leetcode.com/problems/lfu-cache | Click |
| 33. | Concatenated Words | https://leetcode.com/problems/concatenated-words | |
| 34. | Subtree of Another Tree | https://leetcode.com/problems/subtree-of-another-tree | |
| 35. | Design In-Memory File System | https://leetcode.com/problems/design-in-memory-file-system | |
| 36. | Design Search Autocomplete System | https://leetcode.com/problems/design-search-autocomplete-system | |
| 37. | Top K Frequent Words | https://leetcode.com/problems/top-k-frequent-words | Click |
| 38. | Number of Distinct Islands | https://leetcode.com/problems/number-of-distinct-islands | |
| 39. | Partition Labels | https://leetcode.com/problems/partition-labels | |
| 40. | Most Common Word | https://leetcode.com/problems/most-common-word | Click |
| 41. | All Nodes Distance K in Binary Tree | https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree | |
| 42. | Snakes and Ladders | https://leetcode.com/problems/snakes-and-ladders | |
| 43. | Reorder Data in Log Files | https://leetcode.com/problems/reorder-data-in-log-files | |
| 44. | Prison Cells After N Days | https://leetcode.com/problems/prison-cells-after-n-days | |
| 45. | K Closest Points to Origin | https://leetcode.com/problems/k-closest-points-to-origin | Click |
| 46. | Rotting Oranges | https://leetcode.com/problems/rotting-oranges | Click |
| 47. | Analyze User Website Visit Pattern | https://leetcode.com/problems/analyze-user-website-visit-pattern | |
| 48. | Minimum Cost to Connect Sticks | https://leetcode.com/problems/minimum-cost-to-connect-sticks | |
| 49. | Critical Connections in a Network | https://leetcode.com/problems/critical-connections-in-a-network | |