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
- Count Prefix and Suffix Pairs IIhardArrayStringTrieRolling Hash+31 company
- Promise Poolmedium1 company
- Ad-Free SessionseasyDatabase1 company
- Add Two Polynomials Represented as Linked ListsmediumLinked ListMathTwo Pointers1 company
- All Valid Triplets That Can Represent a CountryeasyDatabase1 company
- Armstrong NumbereasyMath1 company
- Build Binary Expression Tree From Infix ExpressionhardStringStackTreeBinary Tree1 company
- Clone N-ary TreemediumHash TableTreeDepth-First SearchBreadth-First Search1 company
- Connecting Cities With Minimum CostmediumUnion-FindGraph TheoryHeap (Priority Queue)Minimum Spanning Tree1 company
- Count Beautiful Substrings IIhardHash TableMathStringNumber Theory+11 company
- Count Number of Special SubsequenceshardArrayDynamic Programming1 company
- Count Numbers With Unique Digits IIeasyHash TableMathDynamic Programming1 company
- Count Pairs Of NodeshardArrayHash TableTwo PointersBinary Search+31 company
- Count Triplets with Even XOR Set Bits IeasyArrayBit Manipulation1 company
- Count Triplets with Even XOR Set Bits IImediumArrayBit Manipulation1 company
- Count Ways to Make Array With ProducthardArrayMathDynamic ProgrammingCombinatorics+31 company
- Count the Number of K-Big IndiceshardArrayBinary SearchDivide and ConquerBinary Indexed Tree+31 company
- Count the Number of K-Free SubsetsmediumArrayMathDynamic ProgrammingSorting+11 company
- Decode XORed PermutationmediumArrayBit Manipulation1 company
- Diet Plan PerformanceeasyArraySliding Window1 company
- Digit Count in RangehardMathDynamic Programming1 company
- Distinct Numbers in Each SubarraymediumArrayHash TableSliding Window1 company
- Employees With DeductionsmediumDatabase1 company
- Equal Tree PartitionmediumTreeDepth-First SearchBinary Tree1 company
- Find Cumulative Salary of an EmployeehardDatabase1 company
- Find Interview CandidatesmediumDatabase1 company
- Find K-Length Substrings With No Repeated CharactersmediumHash TableStringSliding Window1 company
- Find Total Time Spent by Each EmployeeeasyDatabase1 company
- Find Xor-Beauty of ArraymediumArrayMathBit Manipulation1 company
- Find the Missing IDsmediumDatabase1 company
- Find the Team SizeeasyDatabase1 company
- Friendly Movies Streamed Last MontheasyDatabase1 company
- Global and Local InversionsmediumArrayMath1 company
- Grand Slam TitlesmediumDatabase1 company
- Index Pairs of a StringeasyArrayStringTrieSorting+11 company
- Jump Game VIIImediumArrayDynamic ProgrammingStackGraph Theory+21 company
- Largest Multiple of ThreehardArrayMathDynamic ProgrammingGreedy+11 company
- Largest Unique NumbereasyArrayHash TableSorting1 company
- Longest Winning StreakhardDatabase1 company
- Make Three Strings EqualeasyString1 company
- Maximal Range That Each Element Is Maximum in ItmediumArrayStackMonotonic Stack1 company
- Maximize Points After Choosing K TasksmediumArrayGreedySortingHeap (Priority Queue)1 company
- Maximize the Beauty of the GardenhardArrayHash TableGreedyPrefix Sum1 company
- Maximum Average SubtreemediumTreeDepth-First SearchBinary Tree1 company
- Maximum Balanced Subsequence SumhardArrayBinary SearchDynamic ProgrammingBinary Indexed Tree+11 company
- Maximum Calories Burnt from JumpsmediumArrayTwo PointersGreedySorting1 company
- Maximum Linear Stock ScoremediumArrayHash Table1 company
- Maximum Score After Binary SwapsmediumArrayStringGreedyHeap (Priority Queue)1 company
- Maximum Sum Score of ArraymediumArrayPrefix Sum1 company
- Maximum Sum of Almost Unique SubarraymediumArrayHash TableSliding Window1 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.