Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 271 | Find Words That Can Be Formed by Characters | Easy | ArrayHash TableString |
| 272 | First Letter to Appear Twice | Easy | Hash TableStringBit Manipulation |
| 273 | First Unique Character in a String | Easy | Hash TableStringQueue |
| 274 | Fizz Buzz | Easy | MathStringSimulation |
| 275 | Flip Game | Easy | String |
| 276 | Flip String to Monotone Increasing | Medium | StringDynamic Programming |
| 277 | Fraction Addition and Subtraction | Medium | MathStringSimulation |
| 278 | Fraction to Recurring Decimal | Medium | Hash TableMathString |
| 279 | Freedom Trail | Hard | StringDynamic ProgrammingDepth-First Search |
| 280 | Frequencies of Shortest Supersequences | Hard | ArrayStringBit Manipulation |
| 281 | Frequency-Matched Strings | Medium | HashingHashMapString |
| 282 | Furthest Point From Origin | Easy | StringCounting |
| 283 | Generalized Abbreviation | Medium | StringBacktrackingBit Manipulation |
| 284 | Generate a String With Characters That Have Odd Counts | Easy | String |
| 285 | Generate Binary Strings Without Adjacent Zeros | Medium | StringBacktrackingBit Manipulation |
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