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
- Count Subarrays With Majority Element ImediumArrayHash TableDivide and ConquerSegment Tree+35 companies
- Find Unique Binary StringmediumArrayHash TableStringBacktracking5 companies
- Maximum Difference Between Even and Odd Frequency IIhardStringSliding WindowEnumerationPrefix Sum5 companies
- Root Equals Sum of ChildreneasyTreeBinary Tree5 companies
- Smallest Divisible Digit Product IeasyMathEnumeration5 companies
- Apply Operations to an ArrayeasyArrayTwo PointersSimulation5 companies
- Fair Candy SwapeasyArrayHash TableBinary SearchSorting5 companies
- Find the Original Typed String IIhardStringDynamic ProgrammingPrefix Sum5 companies
- Maximize Active Section with Trade ImediumStringEnumeration5 companies
- Number of ZigZag Arrays IhardDynamic ProgrammingPrefix Sum5 companies
- Biggest Single NumbereasyDatabase5 companies
- Four DivisorsmediumArrayMathPrime FactorizationSieve Theory5 companies
- Maximum Building HeighthardArrayMathSorting5 companies
- Smallest Palindromic Rearrangement ImediumStringSortingCounting Sort5 companies
- Maximum Length Substring With Two OccurrenceseasyHash TableStringSliding Window5 companies
- Bitwise AND of Numbers RangemediumBit Manipulation5 companies
- Minimum Moves to Equal Array ElementsmediumArrayMath5 companies
- Find the Lexicographically Largest String From the Box ImediumTwo PointersStringEnumeration5 companies
- Find the Minimum and Maximum Number of Nodes Between Critical PointsmediumLinked List5 companies
- Maximum Number of BalloonseasyHash TableStringCounting5 companies
- Minimum Number GameeasyArraySortingHeap (Priority Queue)Simulation5 companies
- Number of Sub-arrays With Odd SummediumArrayMathDynamic ProgrammingPrefix Sum5 companies
- Reach a NumbermediumMathBinary Search5 companies
- Maximum Difference Between Increasing ElementseasyArray5 companies
- Count Total Number of Colored CellsmediumMath5 companies
- Sort the PeopleeasyArrayHash TableStringSorting5 companies
- Binary Tree Level Order Traversal IImediumTreeBreadth-First SearchBinary Tree5 companies
- Find the Number of Subsequences With Equal GCDhardArrayMathDynamic ProgrammingNumber Theory+25 companies
- Find the Original Typed String IeasyString5 companies
- Longest Balanced Substring IImediumHash TableStringPrefix Sum5 companies
- Longest Subarray With Maximum Bitwise ANDmediumArrayBit ManipulationBrainteaser5 companies
- Make Array Elements Equal to ZeroeasyArraySimulationPrefix Sum5 companies
- Add Two Promiseseasy5 companies
- The Two Sneaky Numbers of DigitvilleeasyArrayHash TableMath5 companies
- Maximum Difference Between Adjacent Elements in a Circular ArrayeasyArray5 companies
- Minimum Bit Flips to Convert NumbereasyBit Manipulation5 companies
- Strong Password CheckerhardStringGreedyHeap (Priority Queue)5 companies
- Convert Integer to the Sum of Two No-Zero IntegerseasyMath4 companies
- Count Square Sum TripleseasyMathEnumeration4 companies
- Jump Game IIImediumArrayDepth-First SearchBreadth-First Search4 companies
- Rank Teams by VotesmediumArrayHash TableStringSorting+14 companies
- Teemo AttackingeasyArraySimulation4 companies
- IP to CIDRmediumStringBit Manipulation4 companies
- Largest Combination With Bitwise AND Greater Than ZeromediumArrayHash TableBit ManipulationCounting4 companies
- Longest Path With Different Adjacent CharactershardArrayStringTreeDepth-First Search+24 companies
- Parse Lisp ExpressionhardHash TableStringStackRecursion4 companies
- Number of Orders in the BacklogmediumArrayHeap (Priority Queue)Simulation4 companies
- Maximize the Confusion of an ExammediumStringBinary SearchSliding WindowPrefix Sum4 companies
- Count Sub IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+14 companies
- Customer Placing the Largest Number of OrderseasyDatabase4 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.