Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 2574. Left and Right Sum Differences | Easy | 10.3% | TopicsArrayPrefix Sum |
| 3689. Maximum Total Subarray Value I | Medium | 10.3% | TopicsArrayGreedy |
| 1189. Maximum Number of Balloons | Easy | 10.3% | TopicsHash TableStringCounting |
| 1967. Number of Strings That Appear as Substrings in Word | Easy | 10.3% | TopicsArrayString |
| 3620. Network Recovery Pathways | Hard | 10.3% | TopicsArrayBinary SearchDynamic ProgrammingGraph TheoryTopological SortHeap (Priority Queue)Shortest Path |
| 3756. Concatenate Non-Zero Digits and Multiply by Sum II | Medium | 10.3% | TopicsMathStringPrefix Sum |
| 3532. Path Existence Queries in a Graph I | Medium | 10.3% | TopicsArrayHash TableBinary SearchUnion-FindGraph Theory |
| 3312. Sorted GCD Pair Queries | Hard | 10.3% | TopicsArrayHash TableMathBinary SearchCombinatoricsCountingNumber TheoryPrefix SumEuclidean AlgorithmGreatest Common Divisor |
| 3536. Maximum Product of Two Digits | Easy | 10.3% | TopicsMathSorting |
| 4007. Widest Possible Fence | Hard | 10.3% | TopicsArrayHash TableCountingEnumeration |
| 3731. Find Missing Elements | Easy | 10.3% | TopicsArrayHash TableSorting |
| 2996. Smallest Missing Integer Greater Than Sequential Prefix Sum | Easy | 10.3% | TopicsArrayHash TableSorting |
| 2029. Stone Game IX | Medium | 10.3% | TopicsArrayMathGreedyMinimaxCountingGame TheoryNim GameZero-Sum Game |
| 2904. Shortest and Lexicographically Smallest Beautiful String | Medium | 10.3% | TopicsStringSliding Window |
| Implement Rand10() Using Rand7() | Medium | 10.3% | TopicsMathRejection SamplingRandomizedProbability and Statistics |
| 3875. Construct Uniform Parity Array I | Easy | 10.3% | TopicsArrayMath |
| 3870. Count Commas in Range | Easy | 10.3% | TopicsMath |
| 1190. Reverse Substrings Between Each Pair of Parentheses | Medium | 10.3% | TopicsStringStackBracket Sequences |
| 3551. Minimum Swaps to Sort by Digit Sum | Medium | 10.3% | TopicsArrayHash TableSorting |
| Closest Binary Search Tree Value II | Hard | 7.2% | TopicsTwo PointersStackTreeDepth-First SearchBinary Search TreeHeap (Priority Queue)Binary Tree |
| Maximum Product of Word Lengths | Medium | 7.2% | TopicsArrayStringBit Manipulation |
| Create Maximum Number | Hard | 7.2% | TopicsArrayTwo PointersStackGreedyMonotonic Stack |
| Palindrome Pairs | Hard | 7.2% | TopicsArrayHash TableStringTrieHash Function |
| Find Leaves of Binary Tree | Medium | 7.2% | TopicsTreeDepth-First SearchBinary TreeDP on Trees |
| Plus One Linked List | Medium | 7.2% | TopicsLinked ListMath |
