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
- Array With Elements Not Equal to Average of NeighborsmediumArrayGreedySorting1 company
- Calculate Digit Sum of a StringeasyStringSimulation1 company
- Check If String Is a Prefix of ArrayeasyArrayTwo PointersString1 company
- Falling SquareshardArraySegment TreeOrdered Set1 company
- Find Pattern in Infinite Stream ImediumArraySliding WindowRolling HashString Matching+21 company
- Find Pattern in Infinite Stream IIhardArraySliding WindowRolling HashString Matching+21 company
- Fixed PointeasyArrayBinary Search1 company
- Hopper Company Queries IhardDatabase1 company
- Hopper Company Queries IIhardDatabase1 company
- Hopper Company Queries IIIhardDatabase1 company
- Match Alphanumerical Pattern in Matrix ImediumArrayHash TableStringMatrix1 company
- Maximize Win From Two SegmentsmediumArrayBinary SearchSliding Window1 company
- Maximum Increasing Triplet ValuemediumArrayOrdered Set1 company
- Maximum Number of Eaten ApplesmediumArrayGreedyHeap (Priority Queue)1 company
- Minimum Absolute Sum DifferencemediumArrayBinary SearchSortingOrdered Set1 company
- Minimum Operations to Make Binary Array Elements Equal to One IImediumArrayDynamic ProgrammingGreedy1 company
- Number Of Ways To Reconstruct A TreehardArrayHash TableTreeGraph Theory+11 company
- Number of Nodes in the Sub-Tree With the Same LabelmediumHash TableTreeDepth-First SearchBreadth-First Search+21 company
- Number of People That Can Be Seen in a GridmediumArrayStackMatrixMonotonic Stack1 company
- Number of Ways to Reach Destination in the GridhardMathDynamic ProgrammingCombinatorics1 company
- Minimum Moves to Capture The QueenmediumMathEnumeration1 company
- Permutations IIImediumArrayBacktracking1 company
- Product of Two Run-Length Encoded ArraysmediumArrayTwo Pointers1 company
- Count the Number of Good SubsequencesmediumHash TableMathStringCombinatorics+11 company
- Minimum Number of Visited Cells in a GridhardArrayDynamic ProgrammingStackBreadth-First Search+41 company
- Maximum Team Size with Overlapping Intervalsmedium1 company
- Smallest Sufficient TeamhardArrayDynamic ProgrammingBit ManipulationBitmask1 company
- Article Views IImediumDatabase1 company
- Maximize Total Tastiness of Purchased FruitsmediumArrayDynamic Programming1 company
- Minimum Increase to Maximize Special IndicesmediumArrayDynamic ProgrammingGreedyPrefix Sum1 company
- New Users Daily CountmediumDatabase1 company
- Time to Cross a BridgehardArrayHeap (Priority Queue)Simulation1 company
- User Purchase PlatformhardDatabase1 company
- Design Event ManagermediumArrayHash TableDesignHeap (Priority Queue)+11 company
- Find All Good IndicesmediumArrayDynamic ProgrammingPrefix Sum1 company
- Maximize Palindrome Length From SubsequenceshardStringDynamic Programming1 company
- Minimum Health to Beat GamemediumArrayGreedy1 company
- Perform String ShiftseasyArrayMathString1 company
- Sort the Jumbled NumbersmediumArraySorting1 company
- Apply SubstitutionsmediumArrayHash TableStringDepth-First Search+31 company
- Reformat DateeasyString1 company
- Sum of Total Strength of WizardshardArrayStackMonotonic StackPrefix Sum1 company
- Finding MK AveragehardDesignQueueHeap (Priority Queue)Data Stream+21 company
- Make Costs of Paths Equal in a Binary TreemediumArrayDynamic ProgrammingGreedyTree+11 company
- Minimum Operations to Make Array Non DecreasingmediumArrayGreedy1 company
- Minimum Cost to Equalize ArrayhardArrayGreedyEnumeration1 company
- Lexicographically Smallest Negated Permutation that Sums to TargetmediumArrayMathTwo PointersGreedy+11 company
- Maximum K to Sort a PermutationmediumArrayBit Manipulation1 company
- Apply Discount to PricesmediumString1 company
- Find the Number of Possible Ways for an EventhardMathDynamic ProgrammingCombinatorics1 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.