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
- Sort Vowels in a StringmediumStringSorting3 companies
- Special Array IImediumArrayBinary SearchPrefix Sum3 companies
- Substrings of Size Three with Distinct CharacterseasyHash TableStringSliding WindowCounting3 companies
- Tallest BillboardhardArrayDynamic ProgrammingMeet in the MiddleKnapsack Problem+13 companies
- Minimum Insertions to Balance a Parentheses StringmediumStringStackGreedyBracket Sequences3 companies
- Shortest Subarray With OR at Least K IImediumArrayBit ManipulationSliding Window3 companies
- 1-bit and 2-bit CharacterseasyArray3 companies
- Check if Array is GoodeasyArrayHash TableSorting3 companies
- Count Good Triplets in an ArrayhardArrayBinary SearchDivide and ConquerBinary Indexed Tree+33 companies
- Count the Number of Computer Unlocking PermutationsmediumArrayMathBrainteaserCombinatorics3 companies
- Jump Game IXmediumArrayDynamic Programming3 companies
- Maximize Active Section with Trade IIhardArrayStringBinary SearchSegment Tree3 companies
- Maximize the Minimum Powered CityhardArrayBinary SearchGreedyQueue+23 companies
- Minimum String Length After Removing SubstringseasyStringStackSimulation3 companies
- Sort Byeasy3 companies
- Transpose FilemediumShell3 companies
- Daily Leads and PartnerseasyDatabase3 companies
- Maximum Total Subarray Value ImediumArrayGreedy3 companies
- Mirror ReflectionmediumMathGeometryNumber TheoryLeast Common Multiple+13 companies
- Number of Segments in a StringeasyString3 companies
- Numbers With Same Consecutive DifferencesmediumBacktrackingBreadth-First Search3 companies
- Broken CalculatormediumMathGreedy3 companies
- Check if Two Chessboard Squares Have the Same ColoreasyMathString3 companies
- Create Target Array in the Given OrdereasyArraySimulation3 companies
- Decoded String at IndexmediumStringStack3 companies
- Difference Between Element Sum and Digit Sum of an ArrayeasyArrayMath3 companies
- Find Beautiful Indices in the Given Array ImediumTwo PointersStringBinary SearchRolling Hash+53 companies
- Find Minimum Operations to Make All Elements Divisible by ThreeeasyArrayMath3 companies
- Minimum Number of Coins to be AddedmediumArrayGreedySorting3 companies
- The Dining PhilosophersmediumConcurrency3 companies
- The Number of Beautiful SubsetsmediumArrayHash TableMathDynamic Programming+33 companies
- 3Sum With MultiplicitymediumArrayHash TableTwo PointersSorting+13 companies
- Maximize Spanning Tree Stability with UpgradeshardBinary SearchGreedyUnion-FindGraph Theory+13 companies
- Minimum Index of a Valid SplitmediumArrayHash TableSorting3 companies
- Number ComplementeasyBit Manipulation3 companies
- Cyclically Rotating a GridmediumArrayMatrixSimulation3 companies
- Binary Prefix Divisible By 5easyArrayBit Manipulation3 companies
- Check If a Word Occurs As a Prefix of Any Word in a SentenceeasyTwo PointersStringString Matching3 companies
- Check if Strings Can be Made Equal With Operations IImediumHash TableStringSorting3 companies
- Count Number of Ways to Place HousesmediumDynamic Programming3 companies
- Count Special QuadrupletseasyArrayHash TableEnumeration3 companies
- Escape a Large MazehardArrayHash TableDepth-First SearchBreadth-First Search+13 companies
- Implement RoutermediumArrayHash TableBinary SearchDesign+23 companies
- Longest Turbulent SubarraymediumArrayDynamic ProgrammingSliding Window3 companies
- Maximum Total Subarray Value IIhardArrayGreedySegment TreeHeap (Priority Queue)3 companies
- Maximum Walls Destroyed by RobotshardArrayBinary SearchDynamic ProgrammingSorting3 companies
- Minimum Distance Between Three Equal Elements IImediumArrayHash Table3 companies
- Non-decreasing SubsequencesmediumArrayHash TableBacktrackingBit Manipulation3 companies
- Restore Finishing OrdereasyArrayHash Table3 companies
- Second Largest Digit in a StringeasyHash TableString3 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.