Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 376 | Number of Flowers in Full Bloom | Hard | ArrayHash TableBinary Search |
| 377 | Number of Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 378 | Number of Laser Beams in a Bank | Medium | ArrayMathString |
| 379 | Number of Matching Subsequences | Medium | ArrayHash TableString |
| 380 | Number of Music Playlists | Hard | MathDynamic ProgrammingCombinatorics |
| 381 | Number of Segments in a String | Easy | String |
| 382 | Number of Senior Citizens | Easy | ArrayString |
| 383 | Number of Spaces Cleaning Robot Cleaned | Medium | ArrayMatrixSimulation |
| 384 | Number of Steps to Reduce a Number to Zero | Easy | MathBit Manipulation |
| 385 | Number of Students Doing Homework at a Given Time | Easy | Array |
| 386 | Number of Substrings Containing All Three Characters | Medium | Hash TableStringSliding Window |
| 387 | Number of Unique Categories | Medium | Union FindInteractiveCounting |
| 388 | Number of Valid Words for Each Puzzle | Hard | ArrayHash TableString |
| 389 | Numbers At Most N Given Digit Set | Hard | ArrayMathString |
| 390 | Odd Even Linked List | Medium | Linked List |
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