Problems
Callback's own problems and the LeetCode questions companies have been asking, in one place — pick a category, then filter by company, frequency, status, difficulty, topic, and language.
Asked on LeetCode
3,115 questions · all time
- Maximum Strength of K Disjoint SubarrayshardArrayDynamic ProgrammingPrefix Sum2 companies
- Shortest String That Contains Three StringsmediumStringGreedyEnumeration2 companies
- Leftmost Column with at Least a OnemediumArrayBinary SearchMatrixInteractive2 companies
- Largest Plus SignmediumArrayDynamic Programming2 companies
- Minimum Processing TimemediumArrayGreedySorting2 companies
- RLE IteratormediumArrayDesignCountingIterator2 companies
- Minimum Number of Frogs CroakingmediumStringCounting2 companies
- Number of Ships in a RectanglehardArrayDivide and ConquerInteractive2 companies
- The Earliest Moment When Everyone Become FriendsmediumArrayUnion-FindSorting2 companies
- Find Valid Matrix Given Row and Column SumsmediumArrayGreedyMatrixFlow Network2 companies
- Sort Integers by The Power ValuemediumDynamic ProgrammingMemoizationSorting2 companies
- Find The Original Array of Prefix XormediumArrayBit Manipulation2 companies
- Alert Using Same Key-Card Three or More Times in a One Hour PeriodmediumArrayHash TableStringSorting2 companies
- Minimum Substring Partition of Equal Character FrequencymediumHash TableStringDynamic ProgrammingCounting2 companies
- Find Longest Special Substring That Occurs Thrice IImediumHash TableStringBinary SearchSliding Window+12 companies
- Queries on Number of Points Inside a CirclemediumArrayMathGeometry2 companies
- Count Nodes With the Highest ScoremediumArrayTreeDepth-First SearchBinary Tree+12 companies
- Count Pairs Of Similar StringseasyArrayHash TableStringBit Manipulation+12 companies
- Verbal Arithmetic PuzzlehardArrayMathStringBacktracking2 companies
- Remove Letter To Equalize FrequencyeasyHash TableStringCounting2 companies
- Valid Palindrome IIIhardStringDynamic Programming2 companies
- Divide Array in Sets of K Consecutive NumbersmediumArrayHash TableGreedySorting2 companies
- Factor CombinationsmediumBacktrackingPrime Factorization2 companies
- Count the Number of Incremovable Subarrays IIhardArrayTwo PointersBinary Search2 companies
- Distribute Candies Among Children IeasyMathCombinatoricsEnumeration2 companies
- Distribute Candies Among Children IIIhardMathCombinatorics2 companies
- The Time When the Network Becomes IdlemediumArrayBreadth-First SearchGraph Theory2 companies
- Design an Ordered StreameasyArrayHash TableDesignData Stream2 companies
- Put Boxes Into the Warehouse IImediumArrayGreedySorting2 companies
- Minimum Rounds to Complete All TasksmediumArrayHash TableGreedyCounting2 companies
- Peeking IteratormediumArrayDesignIterator2 companies
- Missing RangeseasyArray2 companies
- Length of the Longest Alphabetical Continuous SubstringmediumString2 companies
- Most Popular Video CreatormediumArrayHash TableStringSorting+12 companies
- Toeplitz MatrixeasyArrayMatrix2 companies
- Count All Valid Pickup and Delivery OptionshardMathDynamic ProgrammingCombinatorics2 companies
- Concatenated WordshardArrayStringDynamic ProgrammingDepth-First Search+22 companies
- Number of Divisible Triplet SumsmediumArrayHash Table2 companies
- Mice and CheesemediumArrayGreedySortingHeap (Priority Queue)2 companies
- Count Unhappy FriendsmediumArraySimulation2 companies
- Number of Squareful ArrayshardArrayHash TableMathDynamic Programming+32 companies
- Sell Diminishing-Valued Colored BallsmediumArrayMathBinary SearchGreedy+22 companies
- Strobogrammatic NumbereasyHash TableTwo PointersString2 companies
- Check if a String Is an Acronym of WordseasyArrayString2 companies
- Count Number of Trapezoids IIhardArrayHash TableMathGeometry2 companies
- Count the Number of Incremovable Subarrays IeasyArrayTwo PointersBinary SearchEnumeration2 companies
- Campus BikesmediumArraySortingHeap (Priority Queue)2 companies
- Check for Contradictions in EquationshardArrayStringDepth-First SearchUnion-Find+12 companies
- Construct Binary Tree from StringmediumStringStackTreeDepth-First Search+12 companies
- Intersection of Multiple ArrayseasyArrayHash TableSortingCounting2 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.