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
- Line ReflectionmediumArrayHash TableMath1 company
- Loan TypeseasyDatabase1 company
- Longest Uncommon Subsequence IImediumArrayHash TableTwo PointersString+11 company
- Longest Uploaded PrefixmediumHash TableBinary SearchUnion-FindDesign+41 company
- Max Value of EquationhardArrayQueueSliding WindowHeap (Priority Queue)+11 company
- Maximum Number That Sum of the Prices Is Less Than or Equal to KmediumMathBinary SearchDynamic ProgrammingBit Manipulation1 company
- Maximum Split of Positive Even IntegersmediumMathBacktrackingGreedy1 company
- Merge Triplets to Form Target TripletmediumArrayGreedy1 company
- Minimum Number of Days to Eat N OrangeshardDynamic ProgrammingMemoization1 company
- Most Frequent Number Following Key In an ArrayeasyArrayHash TableCounting1 company
- My Calendar IIIhardBinary SearchDesignSegment TreePrefix Sum+11 company
- Numbers With Repeated DigitshardMathDynamic Programming1 company
- Output Contest MatchesmediumStringRecursionSimulation1 company
- Pizza With 3n SliceshardArrayDynamic ProgrammingGreedyHeap (Priority Queue)1 company
- Search in a Sorted Array of Unknown SizemediumArrayBinary SearchInteractive1 company
- Sentence SimilarityeasyArrayHash TableString1 company
- Single-Row KeyboardeasyHash TableString1 company
- String TransformationhardMathStringDynamic ProgrammingString Matching1 company
- Top Three WinerieshardDatabase1 company
- Brace Expansion IIhardHash TableStringBacktrackingStack+21 company
- Confusing NumbereasyMath1 company
- Count AsteriskseasyString1 company
- Count Prefixes of a Given StringeasyArrayString1 company
- Design Phone DirectorymediumArrayHash TableLinked ListDesign+11 company
- Distinct Echo SubstringshardStringTrieRolling HashSuffix Array+31 company
- Distribute Repeating IntegershardArrayHash TableDynamic ProgrammingBacktracking+31 company
- Find Anagram MappingseasyArrayHash Table1 company
- Find Kth Largest XOR Coordinate ValuemediumArrayDivide and ConquerBit ManipulationSorting+41 company
- Find Two Non-overlapping Sub-arrays Each With Target SummediumArrayHash TableBinary SearchDynamic Programming+11 company
- Find the Minimum Number of Fibonacci Numbers Whose Sum Is KmediumMathGreedy1 company
- Form Largest Integer With Digits That Add up to TargethardArrayDynamic ProgrammingKnapsack ProblemComplete Knapsack1 company
- K Empty SlotshardArrayBinary Indexed TreeSegment TreeQueue+41 company
- Kth Smallest Subarray SummediumArrayBinary SearchSliding Window1 company
- Lexicographically Smallest String After Applying OperationsmediumStringDepth-First SearchBreadth-First SearchEnumeration1 company
- Longest Chunked Palindrome DecompositionhardTwo PointersStringDynamic ProgrammingGreedy+21 company
- Longest Line of Consecutive One in MatrixmediumArrayDynamic ProgrammingMatrix1 company
- Make Number of Distinct Characters EqualmediumHash TableStringCounting1 company
- Maximize Alternating Sum Using SwapshardArrayGreedyUnion-FindSorting1 company
- Maximum AND Sum of ArrayhardArrayDynamic ProgrammingBit ManipulationBitmask1 company
- Maximum Length of Semi-Decreasing SubarraysmediumArrayStackSortingMonotonic Stack1 company
- Maximum Number of Groups Getting Fresh DonutshardArrayDynamic ProgrammingBit ManipulationMemoization+11 company
- Maximum Score from Performing Multiplication OperationshardArrayDynamic Programming1 company
- Maximum Value of K Coins From PileshardArrayDynamic ProgrammingPrefix Sum1 company
- Merge Similar ItemseasyArrayHash TableSortingOrdered Set1 company
- Minimum Bitwise OR From GridmediumArrayGreedyBit ManipulationMatrix1 company
- Minimum Consecutive Cards to Pick UpmediumArrayHash TableSliding Window1 company
- Minimum Cost to Connect Two Groups of PointshardArrayDynamic ProgrammingBit ManipulationMatrix+61 company
- Minimum Cost to Set Cooking TimemediumMathEnumeration1 company
- Minimum Number of Flips to Make Binary Grid Palindromic IImediumArrayTwo PointersMatrix1 company
- Minimum Number of Operations to Make Word K-PeriodicmediumHash TableStringCounting1 company
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.