| 5. Longest Palindromic Substring | | | Solve | Medium | | |
| 13. Roman to Integer | | | Solve | Easy | | |
| 17. Letter Combinations of a Phone Number | | | Solve | Medium | | |
| 33. Search in Rotated Sorted Array | | | Solve | Medium | | |
| 46. Permutations | | | Solve | Medium | | |
| 55. Jump Game | | | Solve | Medium | | |
| 68. Text Justification | | | Solve | Hard | | |
| 92. Reverse Linked List II | | | Solve | Medium | | |
| 116. Populating Next Right Pointers in Each Node | | | Solve | Medium | | |
| 135. Candy | | | Solve | Hard | | |
| 138. Copy List with Random Pointer | | | Solve | Medium | | |
| 139. Word Break | | | Solve | Medium | | |
| 146. LRU Cache | | | Solve | Medium | | |
| 229. Majority Element II | | | Solve | Medium | | |
| 236. Lowest Common Ancestor of a Binary Tree | | | Solve | Medium | | |
| 239. Sliding Window Maximum | | | Solve | Hard | | |
| 287. Find the Duplicate Number | | | Solve | Medium | | |
| 343. Integer Break | | | Solve | Medium | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 518. Coin Change II | | | Solve | Medium | | |
| 542. 01 Matrix | | | Solve | Medium | | |
| 557. Reverse Words in a String III | | | Solve | Easy | | |
| 632. Smallest Range Covering Elements from K Lists | | | Solve | Hard | | |
| 646. Maximum Length of Pair Chain | | | Solve | Medium | | |
| 706. Design HashMap | | | Solve | Easy | | |
| 735. Asteroid Collision | | | Solve | Medium | | |
| 863. All Nodes Distance K in Binary Tree | | | Solve | Medium | | |
| 894. All Possible Full Binary Trees | | | Solve | Medium | | |
| 967. Numbers With Same Consecutive Differences | | | Solve | Medium | | |
| 982. Triples with Bitwise AND Equal To Zero | | | Solve | Hard | | |
| 1011. Capacity To Ship Packages Within D Days | | | Solve | Medium | | |
| 1094. Car Pooling | | | Solve | Medium | | |
| 1235. Maximum Profit in Job Scheduling | | | Solve | Hard | | |
| 1318. Minimum Flips to Make a OR b Equal to c | | | Solve | Medium | | |
| 1326. Minimum Number of Taps to Open to Water a Garden | | | Solve | Hard | | |
| 1463. Cherry Pickup II | | | Solve | Hard | | |
| 1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree | | | Solve | Hard | | |
| 1502. Can Make Arithmetic Progression From Sequence | | | Solve | Easy | | |
| 1519. Number of Nodes in the Sub-Tree With the Same Label | | | Solve | Medium | | |
| 1561. Maximum Number of Coins You Can Get | | | Solve | Medium | | |
| 1574. Shortest Subarray to be Removed to Make Array Sorted | | | Solve | Medium | | |
| 1700. Number of Students Unable to Eat Lunch | | | Solve | Easy | | |
| 1703. Minimum Adjacent Swaps for K Consecutive Ones | | | Solve | Hard | | |
| 1760. Minimum Limit of Balls in a Bag | | | Solve | Medium | | |
| 1912. Design Movie Rental System | | | Solve | Hard | | |
| 2019. The Score of Students Solving Math Expression | | | Solve | Hard | | |
| 2093. Minimum Cost to Reach City With Discounts | | | Solve | Medium | | |
| 2499. Minimum Total Cost to Make Arrays Unequal | | | Solve | Hard | | |
| 2551. Put Marbles in Bags | | | Solve | Hard | | |
| 2952. Minimum Number of Coins to be Added | | | Solve | Medium | | |
