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
- Number of Unique XOR Triplets ImediumArrayMathBit Manipulation4 companies
- Display the First Three Rowseasy4 companies
- Find Building Where Alice and Bob Can MeethardArrayBinary SearchStackBinary Indexed Tree+34 companies
- Maximum Value of an Ordered Triplet IeasyArrayPrefix Sum4 companies
- Robot CollisionshardArrayStackSortingSimulation4 companies
- Check if an Original String Exists Given Two Encoded StringshardStringDynamic Programming3 companies
- Encrypt and Decrypt StringshardArrayHash TableStringDesign+13 companies
- Maximum Score From Grid OperationshardArrayDynamic ProgrammingMatrixPrefix Sum3 companies
- Minimum Sideway JumpsmediumArrayDynamic ProgrammingGreedy3 companies
- Minimum Space Wasted From PackaginghardArrayBinary SearchSortingPrefix Sum3 companies
- Number of Subarrays With LCM Equal to KmediumArrayMathNumber Theory3 companies
- Shortest Uncommon Substring in an ArraymediumArrayHash TableStringTrie3 companies
- Valid SquaremediumMathGeometry3 companies
- Remove One Element to Make the Array Strictly IncreasingeasyArray3 companies
- Count Collisions on a RoadmediumStringStackSimulation3 companies
- Apply Operations to Make All Array Elements Equal to ZeromediumArrayPrefix Sum3 companies
- Tweet Counts Per FrequencymediumHash TableStringBinary SearchDesign+23 companies
- Maximum Side Length of a Square with Sum Less than or Equal to ThresholdmediumArrayBinary SearchMatrixPrefix Sum3 companies
- Nested List Weight Sum IImediumStackDepth-First SearchBreadth-First Search3 companies
- Count Good MealsmediumArrayHash Table3 companies
- Count the Number of Consistent StringseasyArrayHash TableStringBit Manipulation+13 companies
- Flatten 2D VectormediumArrayTwo PointersDesignIterator3 companies
- Average Waiting TimemediumArraySimulation3 companies
- Check If It Is a Good ArrayhardArrayMathNumber TheoryBézout's Lemma+33 companies
- Zigzag IteratormediumArrayDesignQueueIterator3 companies
- Smallest Range IImediumArrayMathGreedySorting3 companies
- Maximum Candies You Can Get from BoxeshardArrayBreadth-First SearchGraph Theory3 companies
- Shortest Word Distance IImediumArrayHash TableTwo PointersString+13 companies
- Shortest Way to Form StringmediumTwo PointersStringBinary SearchGreedy3 companies
- First Completely Painted Row or ColumnmediumArrayHash TableMatrix3 companies
- Video StitchingmediumArrayDynamic ProgrammingGreedy3 companies
- Merge Operations to Turn Array Into a PalindromemediumArrayTwo PointersGreedy3 companies
- Maximize Greatness of an ArraymediumArrayTwo PointersGreedySorting3 companies
- Longest Non-decreasing Subarray From Two ArraysmediumArrayDynamic Programming3 companies
- Manhattan Distances of All Arrangements of PieceshardMathCombinatorics3 companies
- Maximum Number of AlloysmediumArrayBinary Search3 companies
- Minimum Deletions to Make String K-SpecialmediumHash TableStringGreedySorting+13 companies
- Distribute Money to Maximum ChildreneasyMathGreedy3 companies
- Sort Transformed ArraymediumArrayMathTwo PointersSorting3 companies
- Odd String DifferenceeasyArrayHash TableString3 companies
- Convert to Base -2mediumMath3 companies
- Minimum Number of Vertices to Reach All NodesmediumGraph TheoryDirected Acyclic Graph3 companies
- Pyramid Transition MatrixmediumHash TableStringBacktrackingBit Manipulation3 companies
- Subdomain Visit CountmediumArrayHash TableStringCounting3 companies
- Longest Word in DictionarymediumArrayHash TableStringTrie+13 companies
- Closest Binary Search Tree Value IIhardTwo PointersStackTreeDepth-First Search+33 companies
- Group Shifted StringsmediumArrayHash TableString3 companies
- Closest Leaf in a Binary TreemediumTreeDepth-First SearchBreadth-First SearchBinary Tree3 companies
- Second Minimum Node In a Binary TreeeasyTreeDepth-First SearchBinary Tree3 companies
- Minimum Replacements to Sort the ArrayhardArrayMathGreedy3 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.