2324 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Prefix and Suffix Search | Hard | 5% | TopicsArrayHash TableStringDesignTrie |
| 770. Basic Calculator IV | Hard | 5% | TopicsHash TableMathStringStackRecursion |
| Fraction Addition and Subtraction | Medium | 5% | TopicsMathStringSimulationEuclidean AlgorithmGreatest Common Divisor |
| 589. N-ary Tree Preorder Traversal | Easy | 5% | TopicsStackTreeDepth-First Search |
| 1905. Count Sub Islands | Medium | 5% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 1894. Find the Student that Will Replace the Chalk | Medium | 5% | TopicsArrayBinary SearchSimulationPrefix Sum |
| 2807. Insert Greatest Common Divisors in Linked List | Medium | 5% | TopicsLinked ListMathNumber Theory |
| 1310. XOR Queries of a Subarray | Medium | 5% | TopicsArrayBit ManipulationPrefix Sum |
| 3120. Count the Number of Special Characters I | Easy | 5% | TopicsHash TableString |
| 2419. Longest Subarray With Maximum Bitwise AND | Medium | 5% | TopicsArrayBit ManipulationBrainteaser |
| 884. Uncommon Words from Two Sentences | Easy | 5% | TopicsHash TableStringCounting |
| 3020. Find the Maximum Number of Elements in Subset | Medium | 5% | TopicsArrayHash TableEnumeration |
| 883. Projection Area of 3D Shapes | Easy | 5% | TopicsArrayMathGeometryMatrix |
| 2406. Divide Intervals Into Minimum Number of Groups | Medium | 5% | TopicsArrayTwo PointersGreedySortingHeap (Priority Queue)Prefix Sum |
| 1405. Longest Happy String | Medium | 5% | TopicsStringGreedyHeap (Priority Queue) |
| 2501. Longest Square Streak in an Array | Medium | 5% | TopicsArrayHash TableBinary SearchDynamic ProgrammingSorting |
| 1671. Minimum Number of Removals to Make Mountain Array | Hard | 5% | TopicsArrayBinary SearchDynamic ProgrammingGreedy |
| 2275. Largest Combination With Bitwise AND Greater Than Zero | Medium | 5% | TopicsArrayHash TableBit ManipulationCounting |
| Dot Product of Two Sparse Vectors | Medium | 5% | TopicsArrayHash TableTwo PointersDesignLinear Algebra |
| Maximum Size Subarray Sum Equals k | Medium | 5% | TopicsArrayHash TablePrefix Sum |
| 2571. Minimum Operations to Reduce an Integer to 0 | Medium | 5% | TopicsDynamic ProgrammingGreedyBit Manipulation |
| 2583. Kth Largest Sum in a Binary Tree | Medium | 5% | TopicsTreeBreadth-First SearchSortingBinary Tree |
| 3243. Shortest Distance After Road Addition Queries I | Medium | 5% | TopicsArrayBreadth-First SearchGraph Theory |
| 1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence | Easy | 5% | TopicsTwo PointersStringString Matching |
| Sparse Matrix Multiplication | Medium | 5% | TopicsArrayHash TableMatrixLinear Algebra |
