171 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 2040. Kth Smallest Product of Two Sorted Arrays | Hard | 55.5% | TopicsArrayBinary Search |
| Find K Pairs with Smallest Sums | Medium | 55.5% | TopicsArrayHeap (Priority Queue) |
| 3480. Maximize Subarrays After Removing One Conflicting Pair | Hard | 55.5% | TopicsArraySegment TreeEnumerationPrefix Sum |
| 464. Can I Win | Medium | 54.1% | TopicsMathDynamic ProgrammingBit ManipulationMemoizationGame TheoryBitmask |
| Shortest Word Distance III | Medium | 52.6% | TopicsArrayString |
| Flatten Nested List Iterator | Medium | 52.6% | TopicsStackTreeDepth-First SearchDesignQueueIterator |
| 367. Valid Perfect Square | Easy | 52.6% | TopicsMathBinary Search |
| 1. Two Sum | Easy | 51% | TopicsArrayHash Table |
| Evaluate Reverse Polish Notation | Medium | 51% | TopicsArrayMathStack |
| Lowest Common Ancestor of a Binary Tree II | Medium | 51% | TopicsTreeDepth-First SearchBinary TreeBinary LiftingLowest Common Ancestor |
| Robot Room Cleaner | Hard | 51% | TopicsBacktrackingInteractive |
| 21. Merge Two Sorted Lists | Easy | 49.2% | TopicsLinked ListRecursion |
| 23. Merge k Sorted Lists | Hard | 49.2% | TopicsLinked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort |
| 57. Insert Interval | Medium | 49.2% | TopicsArray |
| Text Justification | Hard | 49.2% | TopicsArrayStringSimulation |
| 102. Binary Tree Level Order Traversal | Medium | 49.2% | TopicsTreeBreadth-First SearchBinary Tree |
| Sparse Matrix Multiplication | Medium | 49.2% | TopicsArrayHash TableMatrixLinear Algebra |
| 886. Possible Bipartition | Medium | 49.2% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph TheoryGraph ColoringBipartite Graph |
| 210. Course Schedule II | Medium | 49.2% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort |
| Merge Two Binary Trees | Easy | 49.2% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| Permutations II | Medium | 47.3% | TopicsArrayBacktrackingSorting |
| 72. Edit Distance | Medium | 47.3% | TopicsStringDynamic Programming |
| 103. Binary Tree Zigzag Level Order Traversal | Medium | 47.3% | TopicsTreeBreadth-First SearchBinary Tree |
| 198. House Robber | Medium | 47.3% | TopicsArrayDynamic Programming |
| 238. Product of Array Except Self | Medium | 47.3% | TopicsArrayPrefix Sum |
