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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 129. Sum Root to Leaf Numbers | Medium | 79.5% | TopicsTreeDepth-First SearchBinary Tree |
| 146. LRU Cache | Medium | 79.2% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| Dot Product of Two Sparse Vectors | Medium | 78.5% | TopicsArrayHash TableTwo PointersDesignLinear Algebra |
| 938. Range Sum of BST | Easy | 78.4% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
| 138. Copy List with Random Pointer | Medium | 77.7% | TopicsHash TableLinked List |
| 973. K Closest Points to Origin | Medium | 76.6% | TopicsArrayMathDivide and ConquerGeometrySortingHeap (Priority Queue)QuickselectK-D Tree |
| 20. Valid Parentheses | Easy | 76.4% | TopicsStringStackBracket Sequences |
| 1004. Max Consecutive Ones III | Medium | 75.8% | TopicsArrayBinary SearchSliding WindowPrefix Sum |
| 23. Merge k Sorted Lists | Hard | 75.6% | TopicsLinked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort |
| 2. Add Two Numbers | Medium | 75.3% | TopicsLinked ListMathRecursion |
| 34. Find First and Last Position of Element in Sorted Array | Medium | 74.1% | TopicsArrayBinary Search |
| 827. Making A Large Island | Hard | 74.1% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 986. Interval List Intersections | Medium | 73.5% | TopicsArrayTwo PointersSweep Line |
| 76. Minimum Window Substring | Hard | 73.4% | TopicsHash TableStringSliding Window |
| 346. Moving Average from Data Stream | Easy | 73.2% | TopicsArrayDesignQueueData Stream |
| 791. Custom Sort String | Medium | 72.9% | TopicsHash TableStringSorting |
| 3Sum | Medium | 72.4% | TopicsArrayTwo PointersSorting |
| 921. Minimum Add to Make Parentheses Valid | Medium | 72% | TopicsStringStackGreedyBracket Sequences |
| 14. Longest Common Prefix | Easy | 71.2% | TopicsArrayStringTrie |
| 133. Clone Graph | Medium | 71.2% | TopicsHash TableDepth-First SearchBreadth-First SearchGraph Theory |
| Maximum Swap | Medium | 71.2% | TopicsMathGreedy |
| 3. Longest Substring Without Repeating Characters | Medium | 70.8% | TopicsHash TableStringSliding Window |
| 4. Median of Two Sorted Arrays | Hard | 69.9% | TopicsArrayBinary SearchDivide and Conquer |
| Remove Duplicates from Sorted Array | Easy | 69.2% | TopicsArrayTwo Pointers |
| 1539. Kth Missing Positive Number | Easy | 69% | TopicsArrayBinary Search |
