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
3,110 questions · all time
- Longest Balanced Subarray ImediumArrayHash TableDivide and ConquerSegment Tree+13 companies
- Longest Binary Subsequence Less Than or Equal to KmediumStringDynamic ProgrammingGreedyMemoization3 companies
- Car Fleet IIhardArrayMathStackHeap (Priority Queue)+13 companies
- DI String MatcheasyArrayTwo PointersStringGreedy3 companies
- Employees Whose Manager Left the CompanyeasyDatabase3 companies
- Magical StringmediumTwo PointersString3 companies
- Maximum Number of Words Found in SentenceseasyArrayString3 companies
- Non-decreasing ArraymediumArray3 companies
- Perfect RectanglehardArrayHash TableMathGeometry+13 companies
- Return Length of Arguments Passedeasy3 companies
- Sleepeasy3 companies
- Count Number of TeamsmediumArrayDynamic ProgrammingBinary Indexed TreeSegment Tree3 companies
- Binary Tree Longest Consecutive Sequence IImediumTreeDepth-First SearchBinary TreeDP on Trees3 companies
- Get Biggest Three Rhombus Sums in a GridmediumArrayMathSortingHeap (Priority Queue)+23 companies
- Maximize Sum Of Array After K NegationseasyArrayGreedySorting3 companies
- Count the Number of Special Characters IImediumHash TableString3 companies
- Double a Number Represented as a Linked ListmediumLinked ListMathStack3 companies
- Find the Pivot IntegereasyMathPrefix Sum3 companies
- Longest Square Streak in an ArraymediumArrayHash TableBinary SearchDynamic Programming+13 companies
- Nth Magical NumberhardMathBinary SearchLeast Common MultipleInclusion-Exclusion Principle3 companies
- Rearrange Products TableeasyDatabase3 companies
- All Ancestors of a Node in a Directed Acyclic GraphmediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort+13 companies
- Apply Transform Over Each Element in Arrayeasy3 companies
- Max Consecutive Ones IImediumArrayDynamic ProgrammingSliding Window3 companies
- Minimum Distance Between BST NodeseasyTreeDepth-First SearchBreadth-First SearchBinary Search Tree+13 companies
- Smallest Good BasehardMathBinary Search3 companies
- Sort Integers by The Number of 1 BitseasyArrayBit ManipulationSortingCounting3 companies
- Maximum Difference by Remapping a DigiteasyMathGreedy3 companies
- Best Time to Buy and Sell Stock VmediumArrayDynamic Programming3 companies
- Fancy SequencehardMathDesignSegment TreeNumber Theory+13 companies
- Map of Highest PeakmediumArrayBreadth-First SearchMatrix3 companies
- Minimum Cost to Hire K WorkershardArrayGreedySortingHeap (Priority Queue)3 companies
- Number of Pairs Satisfying InequalityhardArrayBinary SearchDivide and ConquerBinary Indexed Tree+33 companies
- Total Characters in String After Transformations ImediumHash TableMathStringDynamic Programming+13 companies
- Unique 3-Digit Even NumberseasyArrayHash TableRecursionEnumeration3 companies
- Count Special TripletsmediumArrayHash TableCounting3 companies
- Largest 3-Same-Digit Number in StringeasyString3 companies
- Sales PersoneasyDatabase3 companies
- Taking Maximum Energy From the Mystic DungeonmediumArrayDynamic ProgrammingPrefix Sum3 companies
- Minimum Operations to Exceed Threshold Value IImediumArrayHeap (Priority Queue)Simulation3 companies
- Reshape the MatrixeasyArrayMatrixSimulation3 companies
- Binary Number with Alternating BitseasyBit Manipulation3 companies
- Complete Binary Tree InsertermediumTreeBreadth-First SearchDesignBinary Tree3 companies
- Concatenate Non-Zero Digits and Multiply by Sum IImediumMathStringPrefix Sum3 companies
- GCD of Odd and Even SumseasyMathNumber Theory3 companies
- Keyboard RoweasyArrayHash TableString3 companies
- Minimum Number of K Consecutive Bit FlipshardArrayBit ManipulationQueueSliding Window+23 companies
- Number of Unique Subjects Taught by Each TeachereasyDatabase3 companies
- Sorted GCD Pair QuerieshardArrayHash TableMathBinary Search+63 companies
- Construct the Minimum Bitwise Array IImediumArrayBit Manipulation3 companies
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.