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
- Find the Number of Ways to Place People ImediumArrayMathGeometrySorting+14 companies
- Magic Squares In GridmediumArrayHash TableMathMatrix4 companies
- Words Within Two Edits of DictionarymediumArrayStringTrie4 companies
- Avoid Flood in The CitymediumArrayHash TableBinary SearchGreedy+14 companies
- Base 7easyMathString4 companies
- Generate Binary Strings Without Adjacent ZerosmediumStringBacktrackingBit Manipulation4 companies
- Maximum Matching of Players With TrainersmediumArrayTwo PointersGreedySorting4 companies
- Remove Nodes From Linked ListmediumLinked ListStackRecursionMonotonic Stack4 companies
- Element Appearing More Than 25% In Sorted ArrayeasyArray4 companies
- Minimum Swaps To Make Sequences IncreasinghardArrayDynamic Programming4 companies
- Check if Number is a Sum of Powers of ThreemediumMath4 companies
- Cherry Pickup IIhardArrayDynamic ProgrammingMatrix4 companies
- Clear DigitseasyStringStackSimulation4 companies
- Find Missing ElementseasyArrayHash TableSorting4 companies
- Find the Maximum Length of Valid Subsequence ImediumArrayDynamic Programming4 companies
- Reschedule Meetings for Maximum Free Time IImediumArrayGreedyEnumeration4 companies
- The Earliest and Latest Rounds Where Players CompetehardDynamic ProgrammingMemoization4 companies
- Calculate Money in Leetcode BankeasyMath4 companies
- Concatenate Non-Zero Digits and Multiply by Sum IeasyMath4 companies
- Beautiful ArraymediumArrayMathDivide and Conquer4 companies
- Final Value of Variable After Performing OperationseasyArrayStringSimulation4 companies
- Find the Punishment Number of an IntegermediumMathBacktracking4 companies
- Fruits Into Baskets IIeasyArrayBinary SearchSegment TreeSimulation+14 companies
- Integer ReplacementmediumDynamic ProgrammingGreedyBit ManipulationMemoization4 companies
- Jump Game IVhardArrayHash TableBreadth-First Search4 companies
- Jump Game VIImediumStringDynamic ProgrammingSliding WindowPrefix Sum4 companies
- Number of Zero-Filled SubarraysmediumArrayMath4 companies
- Self Dividing NumberseasyMath4 companies
- Split a String Into the Max Number of Unique SubstringsmediumHash TableStringBacktracking4 companies
- Grumpy Bookstore OwnermediumArraySliding Window4 companies
- Minimum Score After Removals on a TreehardArrayBit ManipulationTreeDepth-First Search4 companies
- Number of Steps to Reduce a Number in Binary Representation to OnemediumStringBit ManipulationSimulation4 companies
- Find Subsequence of Length K With the Largest SumeasyArrayHash TableSortingHeap (Priority Queue)4 companies
- Hamming DistanceeasyBit Manipulation4 companies
- Shifting Letters IImediumArrayStringPrefix Sum4 companies
- Count the Number of Arrays with K Matching Adjacent ElementshardMathCombinatoricsFermat's Little Theorem4 companies
- Find Greatest Common Divisor of ArrayeasyArrayMathNumber TheoryEuclidean Algorithm+14 companies
- Find the Lexicographically Smallest Valid SequencemediumTwo PointersStringDynamic ProgrammingGreedy4 companies
- Find the Maximum Achievable NumbereasyMath4 companies
- Minimum Cost to Move Chips to The Same PositioneasyArrayMathGreedy4 companies
- Ways to Express an Integer as Sum of PowersmediumDynamic Programming4 companies
- Divisor GameeasyMathDynamic ProgrammingBrainteaserGame Theory+14 companies
- Find the Largest Area of Square Inside Two RectanglesmediumArrayMathGeometry4 companies
- Largest Color Value in a Directed GraphhardHash TableStringDynamic ProgrammingGraph Theory+44 companies
- Last Stone Weight IImediumArrayDynamic ProgrammingKnapsack Problem0-1 Knapsack4 companies
- Left and Right Sum DifferenceseasyArrayPrefix Sum4 companies
- Valid Phone NumberseasyShell4 companies
- Minimum Insertion Steps to Make a String PalindromehardStringDynamic Programming4 companies
- Minimum Swaps to Make Strings EqualmediumMathStringGreedy4 companies
- Linked List ComponentsmediumArrayHash TableLinked List4 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.