Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 211 | Find Beautiful Indices in the Given Array II | Hard | Two PointersStringBinary Search |
| 212 | Find Common Characters | Easy | ArrayHash TableString |
| 213 | Find Duplicate File in System | Medium | ArrayHash TableString |
| 214 | Find First Palindromic String in the Array | Easy | ArrayTwo PointersString |
| 215 | Find K-Length Substrings With No Repeated Characters | Medium | Hash TableStringSliding Window |
| 216 | Find Kth Bit in Nth Binary String | Medium | StringRecursionSimulation |
| 217 | Find Longest Awesome Substring | Hard | Hash TableStringBit Manipulation |
| 218 | Find Longest Self-Contained Substring | Hard | Hash TableStringBinary Search |
| 219 | Find Longest Special Substring That Occurs Thrice I | Medium | Hash TableStringBinary Search |
| 220 | Find Longest Special Substring That Occurs Thrice II | Medium | Hash TableStringBinary Search |
| 221 | Find Maximum Number of Non Intersecting Substrings | Medium | Hash TableStringDynamic Programming |
| 222 | Find Maximum Number of String Pairs | Easy | ArrayHash TableString |
| 223 | Find Maximum Removals From Source String | Medium | ArrayHash TableTwo Pointers |
| 224 | Find Mirror Score of a String | Medium | Hash TableStringStack |
| 225 | Find Most Frequent Vowel and Consonant | Easy | Hash TableStringCounting |
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