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
- Unique Substrings in Wraparound StringmediumStringDynamic Programming1 company
- XOR Operation in an ArrayeasyMathBit Manipulation1 company
- Advantage ShufflemediumArrayTwo PointersGreedySorting1 company
- Average Value of Even Numbers That Are Divisible by ThreeeasyArrayMath1 company
- Button with Longest Push TimeeasyArray1 company
- Calculate Delayed Arrival TimeeasyMath1 company
- Cells with Odd Values in a MatrixeasyArrayMathSimulation1 company
- Change Data Typeeasy1 company
- Check Distances Between Same LetterseasyArrayHash TableString1 company
- Check If Digits Are Equal in String After Operations IIhardMathStringCombinatoricsNumber Theory1 company
- Check if There is a Valid Partition For The ArraymediumArrayDynamic Programming1 company
- Check if the Rectangle Corner Is ReachablehardArrayMathDepth-First SearchBreadth-First Search+21 company
- Chunk Arrayeasy1 company
- Closest Node to Path in TreehardArrayTreeDepth-First SearchBreadth-First Search1 company
- Collecting ChocolatesmediumArrayEnumeration1 company
- Compute Decimal RepresentationeasyArrayMath1 company
- Concatenate Array With ReverseeasyArraySimulation1 company
- Convert an Array Into a 2D Array With ConditionsmediumArrayHash Table1 company
- Count AnagramshardHash TableMathStringCombinatorics+21 company
- Count Islands With Total Value Divisible by KmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+11 company
- Count Pairs That Form a Complete Day IImediumArrayHash TableCounting1 company
- Count Prime-Gap Balanced SubarraysmediumArrayMathQueueSliding Window+21 company
- Count Sorted Vowel StringsmediumMathDynamic ProgrammingCombinatorics1 company
- Count Subarrays With K Distinct IntegershardArrayHash TableSliding WindowCounting1 company
- Count Substrings Divisible By Last DigithardStringDynamic Programming1 company
- Count Substrings That Can Be Rearranged to Contain a String ImediumHash TableStringSliding Window1 company
- Count Substrings With K-Frequency Characters ImediumHash TableStringSliding Window1 company
- Count of Substrings Containing Every Vowel and K Consonants ImediumHash TableStringSliding Window1 company
- DNA Pattern RecognitionmediumDatabase1 company
- Decode XORed ArrayeasyArrayBit Manipulation1 company
- Design Exam Scores TrackermediumArrayBinary SearchDesignPrefix Sum1 company
- Design Movie Rental SystemhardArrayHash TableDesignHeap (Priority Queue)+11 company
- Dice Roll SimulationhardArrayDynamic Programming1 company
- Differences Between Two Objectsmedium1 company
- Earliest Second to Mark Indices IIhardArrayBinary SearchGreedyHeap (Priority Queue)1 company
- Employees With Missing InformationeasyDatabase1 company
- Evaluate Valid ExpressionshardHash TableMathStringDivide and Conquer+11 company
- Final Element After Subarray DeletionsmediumArrayMathBrainteaserGame Theory1 company
- Find All Groups of FarmlandmediumArrayDepth-First SearchBreadth-First SearchMatrix1 company
- Find COVID Recovery PatientsmediumDatabase1 company
- Find Maximal Uncovered RangesmediumArraySorting1 company
- Find Maximum Value in a Constrained SequencemediumArrayGreedy1 company
- Find Product Recommendation PairsmediumDatabase1 company
- Find Special Substring of Length KeasyString1 company
- Find Substring With Given Hash ValuehardStringSliding WindowRolling HashHash Function1 company
- Find Sum of Array Product of Magical SequenceshardArrayMathDynamic ProgrammingBit Manipulation+21 company
- Find the Array Concatenation ValueeasyArrayTwo PointersSimulation1 company
- Find the K-Beauty of a NumbereasyMathStringSliding Window1 company
- Find the Number of Copy ArraysmediumArrayMath1 company
- Find the Number of Good Pairs IImediumArrayHash Table1 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.