2324 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Word Ladder II | Hard | 28.3% | TopicsHash TableStringBacktrackingBreadth-First SearchBidirectional Search |
| 144. Binary Tree Preorder Traversal | Easy | 28.3% | TopicsStackTreeDepth-First SearchBinary Tree |
| Delete Duplicate Emails | Easy | 28.3% | TopicsDatabase |
| Encode and Decode Strings | Medium | 28.3% | TopicsArrayStringDesign |
| 350. Intersection of Two Arrays II | Easy | 28.3% | TopicsArrayHash TableTwo PointersBinary SearchSorting |
| Queue Reconstruction by Height | Medium | 28.3% | TopicsArrayBinary Indexed TreeSegment TreeSorting |
| Find Duplicate Subtrees | Medium | 28.3% | TopicsHash TableTreeDepth-First SearchBinary Tree |
| 771. Jewels and Stones | Easy | 28.3% | TopicsHash TableString |
| Design Linked List | Medium | 28.3% | TopicsLinked ListDesign |
| 909. Snakes and Ladders | Medium | 28.3% | TopicsArrayBreadth-First SearchMatrix |
| Queries Quality and Percentage | Easy | 28.3% | TopicsDatabase |
| 1296. Divide Array in Sets of K Consecutive Numbers | Medium | 28.3% | TopicsArrayHash TableGreedySorting |
| 1512. Number of Good Pairs | Easy | 28.3% | TopicsArrayHash TableMathCounting |
| Nth Highest Salary | Medium | 28.3% | TopicsDatabase |
| 3351. Sum of Good Subsequences | Hard | 28.3% | TopicsArrayHash TableDynamic Programming |
| House Robber III | Medium | 27.4% | TopicsDynamic ProgrammingTreeDepth-First SearchBinary TreeDP on Trees |
| Ones and Zeroes | Medium | 27.4% | TopicsArrayStringDynamic ProgrammingKnapsack Problem0-1 Knapsack |
| Robot Return to Origin | Easy | 27.4% | TopicsStringSimulation |
| Insert into a Binary Search Tree | Medium | 27.4% | TopicsTreeBinary Search TreeBinary Tree |
| 779. K-th Symbol in Grammar | Medium | 27.4% | TopicsMathBit ManipulationRecursion |
| 835. Image Overlap | Medium | 27.4% | TopicsArrayMatrix |
| Robot Room Cleaner | Hard | 27.4% | TopicsBacktrackingInteractive |
| 1015. Smallest Integer Divisible by K | Medium | 27.4% | TopicsHash TableMathPigeonhole Principle |
| 1233. Remove Sub-Folders from the Filesystem | Medium | 27.4% | TopicsArrayStringDepth-First SearchTrie |
| 2215. Find the Difference of Two Arrays | Easy | 27.4% | TopicsArrayHash Table |
