Practice problems across 75+ categories
Practice problems frequently asked at Math • 596 problems | 150 Easy | 283 Medium | 161 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | Gray Code | Medium | MathBacktrackingBit Manipulation |
| 242 | Greatest Common Divisor of Strings | Easy | MathString |
| 243 | Greatest Common Divisor Traversal | Hard | ArrayMathUnion Find |
| 244 | Guess Number Higher or Lower II | Medium | MathDynamic ProgrammingGame Theory |
| 245 | Guess the Majority in a Hidden Array | Medium | ArrayMathInteractive |
| 246 | Guess the Word | Hard | ArrayMathString |
| 247 | Handshakes That Don't Cross | Hard | MathDynamic Programming |
| 248 | Happy Number | Easy | Hash TableMathTwo Pointers |
| 249 | Harshad Number | Easy | Math |
| 250 | Hexspeak | Easy | MathString |
| 251 | Implement Rand10() Using Rand7() | Medium | MathRejection SamplingRandomized |
| 252 | Incremental Memory Leak | Medium | MathSimulation |
| 253 | Insert Delete GetRandom O(1) | Medium | ArrayHash TableMath |
| 254 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard | ArrayHash TableMath |
| 255 | Insert Greatest Common Divisors in Linked List | Medium | Linked ListMathNumber Theory |
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