IXL
17 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Range Addition II | Easy | 100% | TopicsArrayMath |
| 295. Find Median from Data Stream | Hard | 94.7% | TopicsTwo PointersDesignSortingHeap (Priority Queue)Data Stream |
| 234. Palindrome Linked List | Easy | 92.6% | TopicsLinked ListTwo PointersStackRecursion |
| 23. Merge k Sorted Lists | Hard | 90.2% | TopicsLinked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort |
| Fraction to Recurring Decimal | Medium | 90.2% | TopicsHash TableMathString |
| Stickers to Spell Word | Hard | 90.2% | TopicsArrayHash TableStringDynamic ProgrammingBacktrackingBit ManipulationMemoizationBitmask |
| 56. Merge Intervals | Medium | 87.6% | TopicsArraySortingQuicksort |
| Fraction Addition and Subtraction | Medium | 87.6% | TopicsMathStringSimulationEuclidean AlgorithmGreatest Common Divisor |
| Find the Derangement of An Array | Medium | 87.6% | TopicsMathDynamic ProgrammingCombinatorics |
| Basic Calculator II | Medium | 77.2% | TopicsMathStringStack |
| Insert Delete GetRandom O(1) | Medium | 72.3% | TopicsArrayHash TableMathDesignRandomized |
| 162. Find Peak Element | Medium | 72.3% | TopicsArrayBinary Search |
| 1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts | Medium | 65.9% | TopicsArrayGreedySorting |
| 1-bit and 2-bit Characters | Easy | 65.9% | TopicsArray |
| Design Snake Game | Medium | 57% | TopicsArrayHash TableDesignQueueSimulation |
| 1347. Minimum Number of Steps to Make Two Strings Anagram | Medium | 57% | TopicsHash TableStringCounting |
| 207. Course Schedule | Medium | 57% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
