146 | LRU Cache | Hard |
155 | Min Stack | Easy |
173 | Binary Search Tree Iterator | Medium |
208 | Implement Trie (Prefix Tree) | Medium |
232 | Implement Queue using Stacks | Easy |
295 | Find Median from Data Stream | Hard |
303 | Range Sum Query - Immutable | Easy |
304 | Range Sum Query 2D - Immutable | Medium |
341 | Flatten Nested List Iterator | Medium |
380 | Insert Delete GetRandom O(1) | Medium |
381 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard |
641 | Design Circular Deque | Medium |
706 | Design HashMap | Easy |
1845 | Seat Reservation Manager | Medium |
2353 | Design a Food Rating System | Medium |
2642 | Design Graph With Shortest Path Calculator | Hard |