| 2. Add Two Numbers | | | Solve | Medium | | |
| 19. Remove Nth Node From End of List | | | Solve | Medium | | |
| 21. Merge Two Sorted Lists | | | Solve | Easy | | |
| 23. Merge k Sorted Lists | | | Solve | Hard | | |
| 24. Swap Nodes in Pairs | | | Solve | Medium | | |
| 25. Reverse Nodes in k-Group | | | Solve | Hard | | |
| 61. Rotate List | | | Solve | Medium | | |
| 82. Remove Duplicates from Sorted List II | | | Solve | Medium | | |
| 83. Remove Duplicates from Sorted List | | | Solve | Easy | | |
| 86. Partition List | | | Solve | Medium | | |
| 92. Reverse Linked List II | | | Solve | Medium | | |
| 109. Convert Sorted List to Binary Search Tree | | | Solve | Medium | | |
| 114. Flatten Binary Tree to Linked List | | | Solve | Medium | | |
| 116. Populating Next Right Pointers in Each Node | | | Solve | Medium | | |
| 117. Populating Next Right Pointers in Each Node II | | | Solve | Medium | | |
| 138. Copy List with Random Pointer | | | Solve | Medium | | |
| 141. Linked List Cycle | | | Solve | Easy | 42gearMobilitySystems+131 | |
| 142. Linked List Cycle II | | | Solve | Medium | | |
| 143. Reorder List | | | Solve | Medium | | |
| 146. LRU Cache | | | Solve | Medium | | |
| 147. Insertion Sort List | | | Solve | Medium | | |
| 148. Sort List | | | Solve | Medium | | |
| 160. Intersection of Two Linked Lists | | | Solve | Easy | | |
| 203. Remove Linked List Elements | | | Solve | Easy | | |
| 206. Reverse Linked List | | | Solve | Easy | | |
| 234. Palindrome Linked List | | | Solve | Easy | | |
| 237. Delete Node in a Linked List | | | Solve | Medium | | |
| 328. Odd Even Linked List | | | Solve | Medium | | |
| 355. Design Twitter | | | Solve | Medium | | |
| 369. Plus One Linked List | | | Solve | Medium | | |
| 379. Design Phone Directory | | | Solve | Medium | | |
| 382. Linked List Random Node | | | Solve | Medium | | |
| 426. Convert Binary Search Tree to Sorted Doubly Linked List | | | Solve | Medium | | |
| 430. Flatten a Multilevel Doubly Linked List | | | Solve | Medium | | |
| 432. All O`one Data Structure | | | Solve | Hard | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 460. LFU Cache | | | Solve | Hard | | |
| 622. Design Circular Queue | | | Solve | Medium | | |
| 641. Design Circular Deque | | | Solve | Medium | - | |
| 705. Design HashSet | | | Solve | Easy | | |
| 706. Design HashMap | | | Solve | Easy | | |
| 707. Design Linked List | | | Solve | Medium | | |
| 708. Insert into a Sorted Circular Linked List | | | Solve | Medium | | |
| 716. Max Stack | | | Solve | Hard | | |
| 725. Split Linked List in Parts | | | Solve | Medium | | |
| 817. Linked List Components | | | Solve | Medium | | |
| 876. Middle of the Linked List | | | Solve | Easy | | |
| 1019. Next Greater Node In Linked List | | | Solve | Medium | | |
| 1171. Remove Zero Sum Consecutive Nodes from Linked List | | | Solve | Medium | | |
| 1206. Design Skiplist | | | Solve | Hard | | |