Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 601 | Repeated DNA Sequences | Medium | Hash TableStringBit Manipulation |
| 602 | Replace Elements in an Array | Medium | ArrayHash TableSimulation |
| 603 | Replace Question Marks in String to Minimize Its Value | Medium | Hash TableStringGreedy |
| 604 | Replace Words | Medium | ArrayHash TableString |
| 605 | Report Spam Message | Medium | ArrayHash TableString |
| 606 | Restore the Array From Adjacent Pairs | Medium | ArrayHash TableDepth-First Search |
| 607 | Reward Top K Students | Medium | ArrayHash TableString |
| 608 | Right Triangles | Medium | ArrayHash TableMath |
| 609 | Rings and Rods | Easy | Hash TableString |
| 610 | Roman to Integer | Easy | Hash TableMathString |
| 611 | Second Largest Digit in a String | Easy | Hash TableString |
| 612 | Select K Disjoint Special Substrings | Medium | Hash TableStringDynamic Programming |
| 613 | Sender With Largest Word Count | Medium | ArrayHash TableString |
| 614 | Sentence Similarity | Easy | ArrayHash TableString |
| 615 | Sentence Similarity II | Medium | ArrayHash TableString |
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