Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1561 | Longest Substring of One Repeating Character | Hard | ArrayStringSegment Tree |
| 1562 | Longest Substring with At Least K Repeating Characters | Medium | Hash TableStringDivide and Conquer |
| 1563 | Longest Substring with At Most K Distinct Characters | Medium | Hash TableStringSliding Window |
| 1564 | Longest Substring with At Most Two Distinct Characters | Medium | Hash TableStringSliding Window |
| 1565 | Longest Substring Without Repeating Characters | Medium | Hash TableStringSliding Window |
| 1566 | Longest Team Pass Streak | Hard | Database |
| 1567 | Longest Turbulent Subarray | Medium | ArrayDynamic ProgrammingSliding Window |
| 1568 | Longest Uncommon Subsequence I | Easy | String |
| 1569 | Longest Uncommon Subsequence II | Medium | ArrayHash TableTwo Pointers |
| 1570 | Longest Unequal Adjacent Groups Subsequence I | Easy | ArrayStringDynamic Programming |
| 1571 | Longest Unequal Adjacent Groups Subsequence II | Medium | ArrayStringDynamic Programming |
| 1572 | Longest Univalue Path | Medium | TreeDepth-First SearchBinary Tree |
| 1573 | Longest Uploaded Prefix | Medium | Hash TableBinary SearchUnion Find |
| 1574 | Longest Valid Parentheses | Hard | StringDynamic ProgrammingStack |
| 1575 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
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