Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 256 | Find Unique Binary String | Medium | ArrayHash TableString |
| 257 | Find Valid Pair of Adjacent Digits in String | Easy | Hash TableStringCounting |
| 258 | Find Words Containing Character | Easy | ArrayString |
| 259 | Find Words That Can Be Formed by Characters | Easy | ArrayHash TableString |
| 260 | First Letter to Appear Twice | Easy | Hash TableStringBit Manipulation |
| 261 | First Unique Character in a String | Easy | Hash TableStringQueue |
| 262 | Fizz Buzz | Easy | MathStringSimulation |
| 263 | Flip Game | Easy | String |
| 264 | Flip String to Monotone Increasing | Medium | StringDynamic Programming |
| 265 | Fraction Addition and Subtraction | Medium | MathStringSimulation |
| 266 | Fraction to Recurring Decimal | Medium | Hash TableMathString |
| 267 | Freedom Trail | Hard | StringDynamic ProgrammingDepth-First Search |
| 268 | Frequencies of Shortest Supersequences | Hard | ArrayStringBit Manipulation |
| 269 | Furthest Point From Origin | Easy | StringCounting |
| 270 | Generalized Abbreviation | Medium | StringBacktrackingBit Manipulation |
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