| Flatten Nested List Iterator | Medium | 65.6% |
| LRU Cache | Medium | 46.8% |
| Min Stack | Medium | 57.7% |
| Binary Search Tree Iterator | Medium | 76.2% |
| Kth Largest Element in a Stream | Easy | 60.7% |
| Design Twitter | Medium | 44.2% |
| Range Sum Query - Mutable | Medium | 42.6% |
| Insert Delete GetRandom O(1) | Medium | 55.3% |
| Insert Delete GetRandom O(1) - Duplicates allowed | Hard | 36.4% |
| Design Hit Counter | Medium | 69.6% |
| Design Excel Sum Formula | Hard | 39.9% |
| Flatten 2D Vector | Medium | 50.4% |
| Simple Bank System | Medium | 69.8% |
| Design Tic-Tac-Toe | Medium | 58.7% |
| All O`one Data Structure | Hard | 44.2% |
| Design File System | Medium | 65.1% |
| Time Based Key-Value Store | Medium | 49.7% |
| Map Sum Pairs | Medium | 57.1% |
| Serialize and Deserialize Binary Tree | Hard | 60.4% |
| Design HashMap | Easy | 66.4% |
| Find Median from Data Stream | Hard | 54.2% |
| LFU Cache | Hard | 48.6% |
| Logger Rate Limiter | Easy | 76.8% |
| Number of Recent Calls | Easy | 78.2% |
| Implement Queue using Stacks | Easy | 69.4% |
| Range Sum Query 2D - Immutable | Medium | 57.9% |
| First Unique Number | Medium | 57.0% |
| Range Sum Query - Immutable | Easy | 71.4% |
| Online Stock Span | Medium | 68.7% |
| Design Circular Queue | Medium | 54.0% |
| Design Add and Search Words Data Structure | Medium | 48.2% |
| Implement Stack using Queues | Easy | 69.4% |
| Design Parking System | Easy | 87.2% |
| Design Browser History | Medium | 78.2% |
| Fancy Sequence | Hard | 18.6% |
| Design Linked List | Medium | 29.9% |
| Serialize and Deserialize BST | Medium | 59.4% |
| Snapshot Array | Medium | 36.7% |
| Exam Room | Medium | 43.2% |
| Design Memory Allocator | Medium | 49.7% |
| Design Task Manager | Medium | 49.1% |
| Maximum Frequency Stack | Hard | 66.6% |
| My Calendar I | Medium | 58.2% |
| Implement Trie (Prefix Tree) | Medium | 69.2% |
| Design In-Memory File System | Hard | 48.4% |
| Design an Array Statistics Tracker | Hard | 35.7% |
| Design Search Autocomplete System | Hard | 49.7% |
| Max Stack | Hard | 45.9% |
| Moving Average from Data Stream | Easy | 80.2% |
| Encode and Decode Strings | Medium | 51.2% |
| Design an Expression Tree With Evaluate Function | Medium | 82.5% |
| Smallest Number in Infinite Set | Medium | 70.6% |
| Design a Stack With Increment Operation | Medium | 79.9% |
| Design Snake Game | Medium | 40.0% |
| Encode and Decode TinyURL | Medium | 86.6% |
| Design A Leaderboard | Medium | 68.1% |
| Product of the Last K Numbers | Medium | 62.9% |
| Design Underground System | Medium | 74.4% |
| Dot Product of Two Sparse Vectors | Medium | 89.9% |
| Design a Food Rating System | Medium | 52.9% |
| Design a Text Editor | Hard | 50.1% |
| Design Log Storage System | Medium | 59.3% |
| Zigzag Iterator | Medium | 66.5% |
| Range Sum Query 2D - Mutable | Medium | 45.4% |
| Range Module | Hard | 44.7% |
| Design HashSet | Easy | 67.8% |
| Kth Ancestor of a Tree Node | Hard | 37.2% |
| Design SQL | Medium | 64.6% |
| Stock Price Fluctuation | Medium | 48.9% |
| Dinner Plate Stacks | Hard | 33.5% |
| Data Stream as Disjoint Intervals | Hard | 60.0% |
| Finding Pairs With a Certain Sum | Medium | 61.6% |
| Stream of Characters | Hard | 52.0% |
| Detect Squares | Medium | 52.3% |
| Shuffle an Array | Medium | 59.6% |
| Find Elements in a Contaminated Binary Tree | Medium | 84.1% |
| Sequentially Ordinal Rank Tracker | Hard | 61.5% |
| Design Front Middle Back Queue | Medium | 56.9% |
| Two Sum III - Data structure design | Easy | 39.1% |
| My Calendar II | Medium | 62.9% |
| Design Circular Deque | Medium | 64.4% |
| Complete Binary Tree Inserter | Medium | 65.0% |
| Encrypt and Decrypt Strings | Hard | 38.1% |
| Operations on Tree | Medium | 45.0% |
| Implement Router | Medium | 39.1% |
| Design Movie Rental System | Hard | 62.6% |
| Implement Trie II (Prefix Tree) | Medium | 63.3% |
| Design Spreadsheet | Medium | 74.3% |
| Design Skiplist | Hard | 59.5% |
| Design a 3D Binary Matrix with Efficient Layer Tracking | Medium | 67.0% |
| Shortest Word Distance II | Medium | 62.7% |
| Peeking Iterator | Medium | 61.3% |
| Design Authentication Manager | Medium | 58.4% |
| Design an Ordered Stream | Easy | 82.6% |
| Implement Magic Dictionary | Medium | 57.7% |
| Design a Todo List | Medium | 59.8% |
| Online Election | Medium | 52.7% |
| RLE Iterator | Medium | 59.2% |
| Count Integers in Intervals | Hard | 35.7% |
| Seat Reservation Manager | Medium | 67.1% |