Problems
Callback's own problems and the LeetCode questions companies have been asking, in one place — filter by category, company, topic, difficulty, and how recently a question showed up.
Asked on LeetCode
175 questions at LinkedIn · all time
- Max StackhardLinked ListStackDesignDoubly-Linked List+1frequency 100.0
- Nested List Weight Sum IImediumStackDepth-First SearchBreadth-First Searchfrequency 95.4
- All O`one Data StructurehardHash TableLinked ListDesignDoubly-Linked Listfrequency 93.8
- Max Consecutive Ones IIImediumArrayBinary SearchSliding WindowPrefix Sumfrequency 83.2
- Shortest Word Distance IImediumArrayHash TableTwo PointersString+1frequency 82.3
- Find the CelebritymediumTwo PointersGraph TheoryInteractivefrequency 80.7
- Maximum SubarraymediumArrayDivide and ConquerDynamic Programmingfrequency 80.4
- Nested List Weight SummediumDepth-First SearchBreadth-First Searchfrequency 79.7
- Valid ParentheseseasyStringStackBracket Sequencesfrequency 79.0
- Word LadderhardHash TableStringBreadth-First SearchBidirectional Searchfrequency 79.0
- Find Leaves of Binary TreemediumTreeDepth-First SearchBinary TreeDP on Treesfrequency 76.7
- Insert Delete GetRandom O(1)mediumArrayHash TableMathDesign+1frequency 75.8
- Can Place FlowerseasyArrayGreedyfrequency 74.5
- Number of IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 74.5
- Letter Combinations of a Phone NumbermediumHash TableStringBacktrackingfrequency 73.6
- Maximum Product SubarraymediumArrayDynamic Programmingfrequency 72.5
- Binary Tree Upside DownmediumTreeDepth-First SearchBinary Treefrequency 70.9
- Find First and Last Position of Element in Sorted ArraymediumArrayBinary Searchfrequency 70.9
- Partition to K Equal Sum SubsetsmediumArrayDynamic ProgrammingBacktrackingBit Manipulation+2frequency 69.2
- Pow(x, n)mediumMathRecursionfrequency 69.2
- Lowest Common Ancestor of a Binary Search TreemediumTreeDepth-First SearchBinary Search TreeBinary Tree+2frequency 66.5
- Minimum Window SubstringhardHash TableStringSliding Windowfrequency 66.5
- Search in Rotated Sorted ArraymediumArrayBinary Searchfrequency 66.5
- Sort Transformed ArraymediumArrayMathTwo PointersSortingfrequency 66.5
- LRU CachemediumHash TableLinked ListDesignDoubly-Linked Listfrequency 65.8
- Paint HousemediumArrayDynamic Programmingfrequency 65.8
- Bulb SwitchermediumMathBrainteaserfrequency 65.0
- Exclusive Time of FunctionsmediumArrayStackfrequency 65.0
- Maximum Depth of Binary TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 65.0
- Serialize and Deserialize Binary TreehardStringTreeDepth-First SearchBreadth-First Search+2frequency 63.4
- Symmetric TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 63.4
- Isomorphic StringseasyHash TableStringfrequency 62.6
- Lowest Common Ancestor of a Binary TreemediumTreeDepth-First SearchBinary TreeBinary Lifting+1frequency 62.6
- Closest Binary Search Tree Value IIhardTwo PointersStackTreeDepth-First Search+3frequency 61.6
- Shortest Word DistanceeasyArrayStringfrequency 61.6
- Find Smallest Letter Greater Than TargeteasyArrayBinary Searchfrequency 60.7
- Random Pick with WeightmediumArrayMathBinary SearchPrefix Sum+1frequency 60.7
- Second Minimum Node In a Binary TreeeasyTreeDepth-First SearchBinary Treefrequency 60.7
- Design Bounded Blocking QueuemediumConcurrencyfrequency 59.7
- Insert Delete GetRandom O(1) - Duplicates allowedhardArrayHash TableMathDesign+1frequency 59.7
- Kth Largest Element in an ArraymediumArrayDivide and ConquerSortingHeap (Priority Queue)+1frequency 59.7
- Lowest Common Ancestor of a Binary Tree IIImediumHash TableTwo PointersTreeBinary Tree+2frequency 58.6
- PermutationsmediumArrayBacktrackingfrequency 58.6
- Factor CombinationsmediumBacktrackingPrime Factorizationfrequency 57.5
- Merge IntervalsmediumArraySortingQuicksortfrequency 57.5
- Repeated DNA SequencesmediumHash TableStringBit ManipulationSliding Window+4frequency 57.5
- Count Integers in IntervalshardDesignSegment TreeOrdered Setfrequency 56.3
- Longest Palindromic SubsequencemediumStringDynamic Programmingfrequency 56.3
- Max Points on a LinehardArrayHash TableMathGeometry+2frequency 56.3
- Valid NumberhardStringfrequency 56.3
Listings only — titles, difficulty, and tags link out to LeetCode. Imported from the leetcode-company-wise-problems snapshot dated 1 June 2025. Frequency is that dataset's own relative score within a company and time range.