Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 646 | Second Largest Digit in a String | Easy | Hash TableString |
| 647 | Select K Disjoint Special Substrings | Medium | Hash TableStringDynamic Programming |
| 648 | Sender With Largest Word Count | Medium | ArrayHash TableString |
| 649 | Sentence Screen Fitting | Medium | ArrayStringDynamic Programming |
| 650 | Sentence Similarity | Easy | ArrayHash TableString |
| 651 | Sentence Similarity II | Medium | ArrayHash TableString |
| 652 | Sentence Similarity III | Medium | ArrayTwo PointersString |
| 653 | Separate Black and White Balls | Medium | Two PointersStringGreedy |
| 654 | Serialize and Deserialize Binary Tree | Hard | StringTreeDepth-First Search |
| 655 | Serialize and Deserialize BST | Medium | StringTreeDepth-First Search |
| 656 | Serialize and Deserialize N-ary Tree | Hard | StringTreeDepth-First Search |
| 657 | Shift Distance Between Two Strings | Medium | ArrayStringPrefix Sum |
| 658 | Shifting Letters | Medium | ArrayStringPrefix Sum |
| 659 | Shifting Letters II | Medium | ArrayStringPrefix Sum |
| 660 | Short Encoding of Words | Medium | ArrayHash TableString |
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