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
1,399 questions at Meta · all time
- Maximum Compatibility Score SummediumArrayDynamic ProgrammingBacktrackingBit Manipulation+8frequency 21.5
- Maximum Number of Darts Inside of a Circular DartboardhardArrayMathGeometryfrequency 21.5
- Maximum Number of Events That Can Be AttendedmediumArrayGreedySortingHeap (Priority Queue)frequency 21.5
- Minimum Absolute Difference in BSTeasyTreeDepth-First SearchBreadth-First SearchBinary Search Tree+1frequency 21.5
- Movie RatingmediumDatabasefrequency 21.5
- Moving Stones Until ConsecutivemediumMathBrainteaserfrequency 21.5
- Moving Stones Until Consecutive IImediumArrayMathSliding WindowSortingfrequency 21.5
- Not Boring MovieseasyDatabasefrequency 21.5
- Number Of Corner RectanglesmediumArrayMathDynamic ProgrammingMatrixfrequency 21.5
- Number of 1 BitseasyDivide and ConquerBit Manipulationfrequency 21.5
- Number of Comments per PosteasyDatabasefrequency 21.5
- Number of Operations to Make Network ConnectedmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theoryfrequency 21.5
- Palindrome Partitioning IIhardStringDynamic Programmingfrequency 21.5
- Path Sum IIImediumTreeDepth-First SearchBinary Treefrequency 21.5
- Project Employees IIeasyDatabasefrequency 21.5
- Project Employees IIImediumDatabasefrequency 21.5
- Range Sum Query 2D - ImmutablemediumArrayDesignMatrixPrefix Sumfrequency 21.5
- Read N Characters Given read4 II - Call Multiple TimeshardArraySimulationInteractivefrequency 21.5
- Remove Duplicates from Sorted List IImediumLinked ListTwo Pointersfrequency 21.5
- Remove Sub-Folders from the FilesystemmediumArrayStringDepth-First SearchTriefrequency 21.5
- Report Contiguous DateshardDatabasefrequency 21.5
- Reported PostseasyDatabasefrequency 21.5
- Search in a Binary Search TreeeasyTreeBinary Search TreeBinary Treefrequency 21.5
- Shifting Letters IImediumArrayStringPrefix Sumfrequency 21.5
- Steps to Make Array Non-decreasingmediumArrayLinked ListDynamic ProgrammingStack+2frequency 21.5
- Stone GamemediumArrayMathDynamic ProgrammingMinimax+2frequency 21.5
- Sum of Beauty of All SubstringsmediumHash TableStringCountingfrequency 21.5
- Task Scheduler IImediumArrayHash TableSimulationfrequency 21.5
- Tenth LineeasyShellfrequency 21.5
- Time Based Key-Value StoremediumHash TableStringBinary SearchDesignfrequency 21.5
- Transpose MatrixeasyArrayMatrixSimulationfrequency 21.5
- User Activity for the Past 30 Days IIeasyDatabasefrequency 21.5
- Web CrawlermediumStringDepth-First SearchBreadth-First SearchInteractivefrequency 21.5
- Words Within Two Edits of DictionarymediumArrayStringTriefrequency 21.5
- Add Bold Tag in StringmediumArrayHash TableStringTrie+2frequency 19.4
- Binary Tree Preorder TraversaleasyStackTreeDepth-First SearchBinary Treefrequency 19.4
- Binary Tree PruningmediumTreeDepth-First SearchBinary Treefrequency 19.4
- Can Make Arithmetic Progression From SequenceeasyArraySortingfrequency 19.4
- Candy CrushmediumArrayTwo PointersMatrixSimulationfrequency 19.4
- Consecutive NumbersmediumDatabasefrequency 19.4
- Construct Binary Search Tree from Preorder TraversalmediumArrayStackTreeBinary Search Tree+2frequency 19.4
- Count of Smaller Numbers After SelfhardArrayBinary SearchDivide and ConquerBinary Indexed Tree+4frequency 19.4
- Count the Hidden SequencesmediumArrayPrefix Sumfrequency 19.4
- Defuse the BombeasyArraySliding Windowfrequency 19.4
- Divisor GameeasyMathDynamic ProgrammingBrainteaserGame Theory+1frequency 19.4
- Encode and Decode StringsmediumArrayStringDesignfrequency 19.4
- Evaluate DivisionmediumArrayStringDepth-First SearchBreadth-First Search+5frequency 19.4
- Find All Numbers Disappeared in an ArrayeasyArrayHash Tablefrequency 19.4
- Find Eventual Safe StatesmediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort+2frequency 19.4
- Find a Peak Element IImediumArrayBinary SearchMatrixfrequency 19.4
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.