Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1351. Count Negative Numbers in a Sorted Matrix | Easy | 29.1% | TopicsArrayBinary SearchMatrix |
| 1496. Path Crossing | Easy | 29.1% | TopicsHash TableString |
| 1502. Can Make Arithmetic Progression From Sequence | Easy | 29.1% | TopicsArraySorting |
| 1584. Min Cost to Connect All Points | Medium | 29.1% | TopicsArrayUnion-FindGraph TheoryMinimum Spanning TreePrim's AlgorithmKruskal's AlgorithmBorůvka's Algorithm |
| 1658. Minimum Operations to Reduce X to Zero | Medium | 29.1% | TopicsArrayHash TableBinary SearchSliding WindowPrefix Sum |
| 1792. Maximum Average Pass Ratio | Medium | 29.1% | TopicsArrayGreedyHeap (Priority Queue) |
| 2250. Count Number of Rectangles Containing Each Point | Medium | 29.1% | TopicsArrayHash TableBinary SearchBinary Indexed TreeSorting |
| 2347. Best Poker Hand | Easy | 29.1% | TopicsArrayHash TableCounting |
| 2342. Max Sum of a Pair With Equal Sum of Digits | Medium | 29.1% | TopicsArrayHash TableSortingHeap (Priority Queue) |
| 2402. Meeting Rooms III | Hard | 29.1% | TopicsArrayHash TableSortingHeap (Priority Queue)Simulation |
| Maximum Number of Books You Can Take | Hard | 29.1% | TopicsArrayDynamic ProgrammingStackMonotonic Stack |
| 2643. Row With Maximum Ones | Easy | 29.1% | TopicsArrayMatrix |
| 2916. Subarrays Distinct Element Sum of Squares II | Hard | 29.1% | TopicsArrayHash TableBinary Indexed TreeSegment Tree |
| 3462. Maximum Sum With at Most K Elements | Medium | 29.1% | TopicsArrayGreedySortingHeap (Priority Queue)Matrix |
| 2170. Minimum Operations to Make the Array Alternating | Medium | 29.1% | TopicsArrayHash TableGreedyCounting |
| 3785. Minimum Swaps to Avoid Forbidden Values | Hard | 29.1% | TopicsArrayHash TableGreedyCounting |
| 3867. Sum of GCD of Formed Pairs | Medium | 29.1% | TopicsArrayMathTwo PointersSortingSimulationNumber Theory |
| 112. Path Sum | Easy | 27.9% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| Pascal's Triangle II | Easy | 27.9% | TopicsArrayDynamic Programming |
| 144. Binary Tree Preorder Traversal | Easy | 27.9% | TopicsStackTreeDepth-First SearchBinary Tree |
| Binary Search Tree Iterator | Medium | 27.9% | TopicsStackTreeDesignBinary Search TreeBinary TreeIterator |
| Department Highest Salary | Medium | 27.9% | TopicsDatabase |
| Bulb Switcher | Medium | 27.9% | TopicsMathBrainteaser |
| Power of Three | Easy | 27.9% | TopicsMathRecursion |
| Logger Rate Limiter | Easy | 27.9% | TopicsHash TableDesignData Stream |
