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
1,223 questions at Bloomberg · all time
- Create a DataFrame from Listeasyfrequency 21.4
- Customers Who Bought All ProductsmediumDatabasefrequency 21.4
- Delete Nodes From Linked List Present in ArraymediumArrayHash TableLinked Listfrequency 21.4
- Delete the Middle Node of a Linked ListmediumLinked ListTwo Pointersfrequency 21.4
- Design Add and Search Words Data StructuremediumStringDepth-First SearchDesignTriefrequency 21.4
- Design a Todo ListmediumArrayHash TableStringDesign+1frequency 21.4
- Divide an Array Into Subarrays With Minimum Cost IeasyArraySortingEnumerationfrequency 21.4
- Expression Add OperatorshardMathStringBacktrackingfrequency 21.4
- Filter Elements from Arrayeasyfrequency 21.4
- Find All K-Distant Indices in an ArrayeasyArrayTwo Pointersfrequency 21.4
- Find Closest Number to ZeroeasyArrayfrequency 21.4
- Find Greatest Common Divisor of ArrayeasyArrayMathNumber TheoryEuclidean Algorithm+1frequency 21.4
- Find N Unique Integers Sum up to ZeroeasyArrayMathfrequency 21.4
- Find Root of N-Ary TreemediumHash TableBit ManipulationTreeDepth-First Searchfrequency 21.4
- Find Subsequence of Length K With the Largest SumeasyArrayHash TableSortingHeap (Priority Queue)frequency 21.4
- Find the Highest AltitudeeasyArrayPrefix Sumfrequency 21.4
- Find the K-th Character in String Game IeasyMathBit ManipulationRecursionSimulationfrequency 21.4
- Find the Lexicographically Smallest Valid SequencemediumTwo PointersStringDynamic ProgrammingGreedyfrequency 21.4
- Find the Maximum Achievable NumbereasyMathfrequency 21.4
- Find the Minimum Area to Cover All Ones ImediumArrayMatrixfrequency 21.4
- Find the Punishment Number of an IntegermediumMathBacktrackingfrequency 21.4
- Guess the WordhardArrayMathStringMinimax+2frequency 21.4
- IPOhardArrayGreedySortingHeap (Priority Queue)frequency 21.4
- Invalid TweetseasyDatabasefrequency 21.4
- Investments in 2016mediumDatabasefrequency 21.4
- K Closest Points to OriginmediumArrayMathDivide and ConquerGeometry+4frequency 21.4
- Longest Balanced Subarray ImediumArrayHash TableDivide and ConquerSegment Tree+1frequency 21.4
- Longest Binary Subsequence Less Than or Equal to KmediumStringDynamic ProgrammingGreedyMemoizationfrequency 21.4
- Longest Nice SubarraymediumArrayBit ManipulationSliding Windowfrequency 21.4
- Max Number of K-Sum PairsmediumArrayHash TableTwo PointersSortingfrequency 21.4
- Max Points on a LinehardArrayHash TableMathGeometry+2frequency 21.4
- Maximum Candies Allocated to K ChildrenmediumArrayBinary Searchfrequency 21.4
- Maximum Number of Vowels in a Substring of Given LengthmediumStringSliding Windowfrequency 21.4
- Maximum Points You Can Obtain from CardsmediumArraySliding WindowPrefix Sumfrequency 21.4
- Maximum Score Words Formed by LettershardArrayHash TableStringDynamic Programming+4frequency 21.4
- Maximum XOR of Two Numbers in an ArraymediumArrayHash TableBit ManipulationTriefrequency 21.4
- Minimum Cost For TicketsmediumArrayDynamic Programmingfrequency 21.4
- Minimum Cost to Move Chips to The Same PositioneasyArrayMathGreedyfrequency 21.4
- Minimum Number of Arrows to Burst BalloonsmediumArrayGreedySortingfrequency 21.4
- Minimum Number of Refueling StopshardArrayDynamic ProgrammingGreedyHeap (Priority Queue)frequency 21.4
- Minimum Time DifferencemediumArrayMathStringSortingfrequency 21.4
- Minimum Time Visiting All PointseasyArrayMathGeometryfrequency 21.4
- Most Stones Removed with Same Row or ColumnmediumHash TableDepth-First SearchUnion-FindGraph Theory+1frequency 21.4
- Movie RatingmediumDatabasefrequency 21.4
- Network Delay TimemediumDepth-First SearchBreadth-First SearchGraph TheoryHeap (Priority Queue)+2frequency 21.4
- New 21 GamemediumMathDynamic ProgrammingSliding WindowProbability and Statisticsfrequency 21.4
- Next Greater Node In Linked ListmediumArrayLinked ListStackMonotonic Stackfrequency 21.4
- Not Boring MovieseasyDatabasefrequency 21.4
- Number of 1 BitseasyDivide and ConquerBit Manipulationfrequency 21.4
- Number of EnclavesmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 21.4
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.