Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1186. Maximum Subarray Sum with One Deletion | Medium | 25.2% | TopicsArrayDynamic Programming |
| 1248. Count Number of Nice Subarrays | Medium | 25.2% | TopicsArrayHash TableMathSliding WindowPrefix Sum |
| Movie Rating | Medium | 25.2% | TopicsDatabase |
| Clone Binary Tree With Random Pointer | Medium | 25.2% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 1520. Maximum Number of Non-Overlapping Substrings | Hard | 25.2% | TopicsHash TableStringGreedySorting |
| 1680. Concatenation of Consecutive Binary Numbers | Medium | 25.2% | TopicsMathBit ManipulationSimulation |
| Invalid Tweets | Easy | 25.2% | TopicsDatabase |
| 1732. Find the Highest Altitude | Easy | 25.2% | TopicsArrayPrefix Sum |
| 1886. Determine Whether Matrix Can Be Obtained By Rotation | Easy | 25.2% | TopicsArrayMatrix |
| 1910. Remove All Occurrences of a Substring | Medium | 25.2% | TopicsStringStackSimulation |
| 2006. Count Number of Pairs With Absolute Difference K | Easy | 25.2% | TopicsArrayHash TableCounting |
| 2035. Partition Array Into Two Arrays to Minimize Sum Difference | Hard | 25.2% | TopicsArrayTwo PointersBinary SearchDynamic ProgrammingBit ManipulationMeet in the MiddleSortingOrdered SetBitmask |
| 2115. Find All Possible Recipes from Given Supplies | Medium | 25.2% | TopicsArrayHash TableStringGraph TheoryTopological SortDirected Acyclic Graph |
| 2110. Number of Smooth Descent Periods of a Stock | Medium | 25.2% | TopicsArrayMathTwo PointersDynamic ProgrammingSliding Window |
| 2130. Maximum Twin Sum of a Linked List | Medium | 25.2% | TopicsLinked ListTwo PointersStack |
| 2160. Minimum Sum of Four Digit Number After Splitting Digits | Easy | 25.2% | TopicsMathGreedySorting |
| 2296. Design a Text Editor | Hard | 25.2% | TopicsLinked ListStringStackDesignSimulationDoubly-Linked List |
| 2398. Maximum Number of Robots Within Budget | Hard | 25.2% | TopicsArrayBinary SearchQueueSliding WindowHeap (Priority Queue)Prefix SumMonotonic Queue |
| 2471. Minimum Number of Operations to Sort a Binary Tree by Level | Medium | 25.2% | TopicsTreeBreadth-First SearchBinary Tree |
| 3020. Find the Maximum Number of Elements in Subset | Medium | 25.2% | TopicsArrayHash TableEnumeration |
| 3075. Maximize Happiness of Selected Children | Medium | 25.2% | TopicsArrayGreedySorting |
| Design an Array Statistics Tracker | Hard | 25.2% | TopicsHash TableBinary SearchDesignQueueHeap (Priority Queue)Data StreamOrdered Set |
| 2193. Minimum Number of Moves to Make Palindrome | Hard | 25.2% | TopicsTwo PointersStringGreedyBinary Indexed Tree |
| 3572. Maximize Y‑Sum by Picking a Triplet of Distinct X‑Values | Medium | 25.2% | TopicsArrayHash TableGreedySortingHeap (Priority Queue) |
| 3640. Trionic Array II | Hard | 25.2% | TopicsArrayDynamic Programming |
