Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 2566. Maximum Difference by Remapping a Digit | Easy | 5% | TopicsMathGreedy |
| 3438. Find Valid Pair of Adjacent Digits in String | Easy | 5% | TopicsHash TableStringCounting |
| 2735. Collecting Chocolates | Medium | 5% | TopicsArrayEnumeration |
| 1639. Number of Ways to Form a Target String Given a Dictionary | Hard | 5% | TopicsArrayStringDynamic Programming |
| Remove Duplicates From an Unsorted Linked List | Medium | 5% | TopicsHash TableLinked List |
| 3021. Alice and Bob Playing Flower Game | Medium | 5% | TopicsMath |
| 3669. Balanced K-Factor Decomposition | Medium | 5% | TopicsMathBacktrackingNumber Theory |
| Reshape Data: Melt | Easy | 5% | Topics— |
| 1201. Ugly Number III | Medium | 5% | TopicsMathBinary SearchCombinatoricsNumber TheoryLeast Common MultipleEuclidean AlgorithmGreatest Common DivisorInclusion-Exclusion Principle |
| 2592. Maximize Greatness of an Array | Medium | 5% | TopicsArrayTwo PointersGreedySorting |
| 3100. Water Bottles II | Medium | 5% | TopicsMathSimulation |
| 3297. Count Substrings That Can Be Rearranged to Contain a String I | Medium | 5% | TopicsHash TableStringSliding Window |
| 1203. Sort Items by Groups Respecting Dependencies | Hard | 5% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
| 3168. Minimum Number of Chairs in a Waiting Room | Easy | 5% | TopicsStringSimulation |
| 825. Friends Of Appropriate Ages | Medium | 5% | TopicsArrayTwo PointersBinary SearchSorting |
| 2320. Count Number of Ways to Place Houses | Medium | 5% | TopicsDynamic Programming |
| 1145. Binary Tree Coloring Game | Medium | 5% | TopicsTreeDepth-First SearchBinary Tree |
| 3664. Two-Letter Card Game | Medium | 5% | TopicsArrayHash TableStringCountingEnumeration |
| 1881. Maximum Value after Insertion | Medium | 5% | TopicsStringGreedy |
| 1948. Delete Duplicate Folders in System | Hard | 5% | TopicsArrayHash TableStringDepth-First SearchTrieSortingHash Function |
| 2389. Longest Subsequence With Limited Sum | Easy | 5% | TopicsArrayBinary SearchGreedySortingPrefix Sum |
| 3347. Maximum Frequency of an Element After Performing Operations II | Hard | 5% | TopicsArrayBinary SearchSliding WindowSortingPrefix Sum |
| 3715. Sum of Perfect Square Ancestors | Hard | 5% | TopicsArrayHash TableMathTreeDepth-First SearchCountingNumber Theory |
| 1446. Consecutive Characters | Easy | 5% | TopicsString |
| 491. Non-decreasing Subsequences | Medium | 5% | TopicsArrayHash TableBacktrackingBit Manipulation |
