Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | Length of Last Word | Easy | String |
| 242 | Length of Longest V-Shaped Diagonal Segment | Hard | ArrayDynamic ProgrammingMemoization |
| 243 | Letter Combinations of a Phone Number | Medium | Hash TableStringBacktracking |
| 244 | License Key Formatting | Easy | String |
| 245 | Linked List Cycle | Easy | Hash TableLinked ListTwo Pointers |
| 246 | Linked List Cycle II | Medium | Hash TableLinked ListTwo Pointers |
| 247 | Linked List Random Node | Medium | Linked ListMathReservoir Sampling |
| 248 | Longest Common Subsequence | Medium | StringDynamic Programming |
| 249 | Longest Increasing Subsequence | Medium | ArrayBinary SearchDynamic Programming |
| 250 | Longest Palindrome | Easy | Hash TableStringGreedy |
| 251 | Longest Substring with At Most K Distinct Characters | Medium | Hash TableStringSliding Window |
| 252 | Longest Substring with At Most Two Distinct Characters | Medium | Hash TableStringSliding Window |
| 253 | Longest Substring Without Repeating Characters | Medium | Hash TableStringSliding Window |
| 254 | Longest Uncommon Subsequence I | Easy | String |
| 255 | Longest Valid Parentheses | Hard | StringDynamic ProgrammingStack |
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