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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 824. Goat Latin | Easy | 61.4% | TopicsString |
| 22. Generate Parentheses | Medium | 60.9% | TopicsStringDynamic ProgrammingBacktrackingBracket Sequences |
| 49. Group Anagrams | Medium | 60.7% | TopicsArrayHash TableStringSorting |
| 219. Contains Duplicate II | Easy | 60.7% | TopicsArrayHash TableSliding Window |
| 21. Merge Two Sorted Lists | Easy | 60.2% | TopicsLinked ListRecursion |
| 523. Continuous Subarray Sum | Medium | 60.2% | TopicsArrayHash TableMathPrefix SumPigeonhole Principle |
| Expression Add Operators | Hard | 59.7% | TopicsMathStringBacktracking |
| 33. Search in Rotated Sorted Array | Medium | 59.1% | TopicsArrayBinary Search |
| 169. Majority Element | Easy | 59.1% | TopicsArrayHash TableDivide and ConquerSortingCountingBoyer–Moore Majority Vote Algorithm |
| 875. Koko Eating Bananas | Medium | 58.6% | TopicsArrayBinary Search |
| 1216. Valid Palindrome III | Hard | 58.6% | TopicsStringDynamic Programming |
| 70. Climbing Stairs | Easy | 58.3% | TopicsMathDynamic ProgrammingMemoization |
| Random Pick Index | Medium | 58.3% | TopicsHash TableMathReservoir SamplingRandomized |
| 127. Word Ladder | Hard | 57.4% | TopicsHash TableStringBreadth-First SearchBidirectional Search |
| 1768. Merge Strings Alternately | Easy | 57.4% | TopicsTwo PointersString |
| 73. Set Matrix Zeroes | Medium | 57.1% | TopicsArrayHash TableMatrix |
| Sliding Window Median | Hard | 57.1% | TopicsArrayHash TableSliding WindowHeap (Priority Queue)Treap |
| Recyclable and Low Fat Products | Easy | 57.1% | TopicsDatabase |
| 75. Sort Colors | Medium | 56.8% | TopicsArrayTwo PointersSortingQuicksortBubble Sort |
| String to Integer (atoi) | Medium | 56.5% | TopicsString |
| Kth Smallest Element in a Sorted Matrix | Medium | 56.5% | TopicsArrayBinary SearchSortingHeap (Priority Queue)Matrix |
| 242. Valid Anagram | Easy | 55.9% | TopicsHash TableStringSorting |
| 7. Reverse Integer | Medium | 55.6% | TopicsMath |
| Longest Consecutive Sequence | Medium | 55.6% | TopicsArrayHash TableUnion-Find |
| 958. Check Completeness of a Binary Tree | Medium | 55.6% | TopicsTreeBreadth-First SearchBinary Tree |
