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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 977. Squares of a Sorted Array | Easy | 55.2% | TopicsArrayTwo PointersSorting |
| 17. Letter Combinations of a Phone Number | Medium | 54.9% | TopicsHash TableStringBacktracking |
| Sliding Window Maximum | Hard | 54.9% | TopicsArrayQueueSliding WindowHeap (Priority Queue)Monotonic QueueRange Minimum/Maximum Query |
| Longest Valid Parentheses | Hard | 54.6% | TopicsStringDynamic ProgrammingStackBracket Sequences |
| 66. Plus One | Easy | 54.6% | TopicsArrayMath |
| Missing Ranges | Easy | 54.6% | TopicsArray |
| 2265. Count Nodes Equal to Average of Subtree | Medium | 54.6% | TopicsTreeDepth-First SearchBinary Tree |
| 48. Rotate Image | Medium | 54.2% | TopicsArrayMathMatrix |
| Meeting Rooms II | Medium | 54.2% | TopicsArrayTwo PointersGreedySortingHeap (Priority Queue)Prefix Sum |
| Alien Dictionary | Hard | 54.2% | TopicsArrayStringDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
| 1047. Remove All Adjacent Duplicates In String | Easy | 54.2% | TopicsStringStack |
| 139. Word Break | Medium | 53.8% | TopicsArrayHash TableStringDynamic ProgrammingTrieMemoizationBrute-Force Search |
| 238. Product of Array Except Self | Medium | 53.8% | TopicsArrayPrefix Sum |
| Decode String | Medium | 53.5% | TopicsStringStackRecursion |
| 54. Spiral Matrix | Medium | 53.1% | TopicsArrayMatrixSimulation |
| 234. Palindrome Linked List | Easy | 53.1% | TopicsLinked ListTwo PointersStackRecursion |
| Create Hello World Function | Easy | 52.7% | Topics— |
| 67. Add Binary | Easy | 52.3% | TopicsMathStringBit ManipulationSimulation |
| 4Sum | Medium | 51.5% | TopicsArrayTwo PointersSorting |
| 62. Unique Paths | Medium | 51.5% | TopicsMathDynamic ProgrammingCombinatorics |
| 124. Binary Tree Maximum Path Sum | Hard | 51.5% | TopicsDynamic ProgrammingTreeDepth-First SearchBinary TreeDP on Trees |
| 766. Toeplitz Matrix | Easy | 51.5% | TopicsArrayMatrix |
| 825. Friends Of Appropriate Ages | Medium | 51.5% | TopicsArrayTwo PointersBinary SearchSorting |
| 28. Find the Index of the First Occurrence in a String | Easy | 51.1% | TopicsTwo PointersStringString MatchingZ AlgorithmKnuth–Morris–Pratt AlgorithmBoyer–Moore String-Search Algorithm |
| 118. Pascal's Triangle | Easy | 51.1% | TopicsArrayDynamic Programming |
