Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Add Binary | Easy | MathStringBit Manipulation |
| 2 | Add Bold Tag in String | Medium | ArrayHash TableString |
| 3 | Add Strings | Easy | MathStringSimulation |
| 4 | Adding Spaces to a String | Medium | ArrayTwo PointersString |
| 5 | Additive Number | Medium | StringBacktracking |
| 6 | Alert Using Same Key-Card Three or More Times in a One Hour Period | Medium | ArrayHash TableString |
| 7 | Alien Dictionary | Hard | ArrayStringDepth-First Search |
| 8 | Alphabet Board Path | Medium | Hash TableString |
| 9 | Ambiguous Coordinates | Medium | StringBacktrackingEnumeration |
| 10 | Analyze User Website Visit Pattern | Medium | ArrayHash TableString |
| 11 | Append Characters to String to Make Subsequence | Medium | Two PointersStringGreedy |
| 12 | Apply Bitwise Operations to Make Strings Equal | Medium | StringBit Manipulation |
| 13 | Apply Discount to Prices | Medium | String |
| 14 | Apply Operations to Make Two Strings Equal | Medium | StringDynamic Programming |
| 15 | Apply Substitutions | Medium | ArrayHash TableString |
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