Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 771. Jewels and Stones | Easy | 35.1% | TopicsHash TableString |
| 1021. Remove Outermost Parentheses | Easy | 35.1% | TopicsStringStackBracket Sequences |
| 1283. Find the Smallest Divisor Given a Threshold | Medium | 35.1% | TopicsArrayBinary Search |
| 1470. Shuffle the Array | Easy | 35.1% | TopicsArray |
| Minimum Number of Primes to Sum to Target | Medium | 35.1% | TopicsArrayMathDynamic ProgrammingNumber Theory |
| Permutations II | Medium | 34.3% | TopicsArrayBacktrackingSorting |
| Flatten Binary Tree to Linked List | Medium | 34.3% | TopicsLinked ListStackTreeDepth-First SearchBinary Tree |
| Dungeon Game | Hard | 34.3% | TopicsArrayDynamic ProgrammingMatrix |
| Sum of Two Integers | Medium | 34.3% | TopicsMathBit Manipulation |
| Kth Smallest Element in a Sorted Matrix | Medium | 34.3% | TopicsArrayBinary SearchSortingHeap (Priority Queue)Matrix |
| 389. Find the Difference | Easy | 34.3% | TopicsHash TableStringBit ManipulationSorting |
| 802. Find Eventual Safe States | Medium | 34.3% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological SortKosaraju's AlgorithmTarjan's SCC Algorithm |
| 1047. Remove All Adjacent Duplicates In String | Easy | 34.3% | TopicsStringStack |
| 1081. Smallest Subsequence of Distinct Characters | Medium | 34.3% | TopicsStringStackGreedyMonotonic Stack |
| 1373. Maximum Sum BST in Binary Tree | Hard | 34.3% | TopicsDynamic ProgrammingTreeDepth-First SearchBinary Search TreeBinary TreeDP on Trees |
| 1552. Magnetic Force Between Two Balls | Medium | 34.3% | TopicsArrayBinary SearchSorting |
| Confirmation Rate | Medium | 34.3% | TopicsDatabase |
| 40. Combination Sum II | Medium | 33.3% | TopicsArrayBacktracking |
| Spiral Matrix II | Medium | 33.3% | TopicsArrayMatrixSimulation |
| 77. Combinations | Medium | 33.3% | TopicsBacktracking |
| Best Time to Buy and Sell Stock III | Hard | 33.3% | TopicsArrayDynamic Programming |
| Nth Highest Salary | Medium | 33.3% | TopicsDatabase |
| Consecutive Numbers | Medium | 33.3% | TopicsDatabase |
| 182. Duplicate Emails | Easy | 33.3% | TopicsDatabase |
| Reverse Bits | Easy | 33.3% | TopicsDivide and ConquerBit Manipulation |
