Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 421 | Maximum XOR of Two Numbers in an Array | Medium | ArrayHash TableBit Manipulation |
| 422 | Valid Word Square | Easy | ArrayMatrix |
| 423 | Reconstruct Original Digits from English | Medium | Hash TableMathString |
| 424 | Longest Repeating Character Replacement | Medium | Hash TableStringSliding Window |
| 425 | Serialize and Deserialize N-ary Tree | Hard | StringTreeDepth-First Search |
| 425 | Word Squares | Hard | ArrayStringBacktracking |
| 426 | Convert Binary Search Tree to Sorted Doubly Linked List | Medium | Linked ListStackTree |
| 427 | Construct Quad Tree | Medium | ArrayDivide and ConquerTree |
| 427 | Flatten a Multilevel Doubly Linked List | Medium | Linked ListDepth-First SearchDoubly-Linked List |
| 429 | All O`one Data Structure | Hard | Hash TableLinked ListDesign |
| 429 | N-ary Tree Level Order Traversal | Medium | TreeBreadth-First Search |
| 430 | Minimum Genetic Mutation | Medium | Hash TableStringBreadth-First Search |
| 431 | Encode N-ary Tree to Binary Tree | Hard | TreeDepth-First SearchBreadth-First Search |
| 434 | Number of Segments in a String | Easy | String |
| 435 | Non-overlapping Intervals | Medium | ArrayDynamic ProgrammingGreedy |
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