Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 3728. Stable Subarrays With Equal Boundary and Interior Sum | Medium | 5% | TopicsArrayHash TablePrefix Sum |
| 2257. Count Unguarded Cells in the Grid | Medium | 5% | TopicsArrayMatrixSimulation |
| Wiggle Sort | Medium | 5% | TopicsArrayGreedySorting |
| Minimum Unique Word Abbreviation | Hard | 5% | TopicsArrayStringBacktrackingBit Manipulation |
| 3608. Minimum Time for K Connected Components | Medium | 5% | TopicsBinary SearchUnion-FindGraph TheorySorting |
| 1551. Minimum Operations to Make Array Equal | Medium | 5% | TopicsMath |
| 3432. Count Partitions with Even Sum Difference | Easy | 5% | TopicsArrayMathPrefix Sum |
| 3243. Shortest Distance After Road Addition Queries I | Medium | 5% | TopicsArrayBreadth-First SearchGraph Theory |
| 3577. Count the Number of Computer Unlocking Permutations | Medium | 5% | TopicsArrayMathBrainteaserCombinatorics |
| 2562. Find the Array Concatenation Value | Easy | 5% | TopicsArrayTwo PointersSimulation |
| 1018. Binary Prefix Divisible By 5 | Easy | 5% | TopicsArrayBit Manipulation |
| 1993. Operations on Tree | Medium | 5% | TopicsArrayHash TableTreeDepth-First SearchBreadth-First SearchDesign |
| 3743. Maximize Cyclic Partition Score | Hard | 5% | TopicsArrayDynamic Programming |
| 3508. Implement Router | Medium | 5% | TopicsArrayHash TableBinary SearchDesignQueueOrdered Set |
| Range Addition II | Easy | 5% | TopicsArrayMath |
| 960. Delete Columns to Make Sorted III | Hard | 5% | TopicsArrayStringDynamic Programming |
| 1390. Four Divisors | Medium | 5% | TopicsArrayMathPrime FactorizationSieve Theory |
| 1380. Lucky Numbers in a Matrix | Easy | 5% | TopicsArrayMatrix |
| Sparse Matrix Multiplication | Medium | 5% | TopicsArrayHash TableMatrixLinear Algebra |
| 865. Smallest Subtree with all the Deepest Nodes | Medium | 5% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchBinary TreeBinary LiftingLowest Common AncestorDP on Trees |
| 1743. Restore the Array From Adjacent Pairs | Medium | 5% | TopicsArrayHash TableDepth-First Search |
| 2007. Find Original Array From Doubled Array | Medium | 5% | TopicsArrayHash TableGreedySorting |
| 1513. Number of Substrings With Only 1s | Medium | 5% | TopicsMathString |
| Promise Time Limit | Medium | 5% | Topics— |
| 3780. Maximum Sum of Three Numbers Divisible by Three | Medium | 5% | TopicsArrayGreedySortingHeap (Priority Queue) |
