| ID | Title | Difficulty |
|---|---|---|
| 430 | Flatten a Multilevel Doubly Linked List | Medium |
| 432 | All O`one Data Structure | Hard |
| 460 | LFU Cache | Hard |
| 1472 | Design Browser History | Medium |
| 2296 | Design a Text Editor | Hard |
| ID | Title | Difficulty |
|---|---|---|
| 430 | Flatten a Multilevel Doubly Linked List | Medium |
| 432 | All O`one Data Structure | Hard |
| 460 | LFU Cache | Hard |
| 1472 | Design Browser History | Medium |
| 2296 | Design a Text Editor | Hard |