Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Build Binary Expression Tree From Infix Expression | Hard | StringStackTree |
| 32 | Bulls and Cows | Medium | Hash TableStringCounting |
| 33 | Calculate Digit Sum of a String | Easy | StringSimulation |
| 34 | Calculate Score After Performing Instructions | Medium | ArrayHash TableString |
| 35 | Camelcase Matching | Medium | ArrayTwo PointersString |
| 36 | Can Convert String in K Moves | Medium | Hash TableString |
| 37 | Can Make Palindrome from Substring | Medium | ArrayHash TableString |
| 38 | Capitalize the Title | Easy | String |
| 39 | Cells in a Range on an Excel Sheet | Easy | String |
| 40 | Change Minimum Characters to Satisfy One of Three Conditions | Medium | Hash TableStringCounting |
| 41 | Check Balanced String | Easy | String |
| 42 | Check Distances Between Same Letters | Easy | ArrayHash TableString |
| 43 | Check if a Parentheses String Can Be Valid | Medium | StringStackGreedy |
| 44 | Check If a String Can Break Another String | Medium | StringGreedySorting |
| 45 | Check If a String Contains All Binary Codes of Size K | Medium | Hash TableStringBit Manipulation |
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