Practice problems across 75+ categories
Practice problems frequently asked at Math • 596 problems | 150 Easy | 283 Medium | 161 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 256 | Handshakes That Don't Cross | Hard | MathDynamic Programming |
| 257 | Happy Number | Easy | Hash TableMathTwo Pointers |
| 258 | Harshad Number | Easy | Math |
| 259 | Hexspeak | Easy | MathString |
| 260 | Implement Rand10() Using Rand7() | Medium | MathRejection SamplingRandomized |
| 261 | Incremental Memory Leak | Medium | MathSimulation |
| 262 | Insert Delete GetRandom O(1) | Medium | ArrayHash TableMath |
| 263 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard | ArrayHash TableMath |
| 264 | Insert Greatest Common Divisors in Linked List | Medium | Linked ListMathNumber Theory |
| 265 | Integer Break | Medium | MathDynamic Programming |
| 266 | Integer to English Words | Hard | MathStringRecursion |
| 267 | Integer to Roman | Medium | Hash TableMathString |
| 268 | K Closest Points to Origin | Medium | ArrayMathDivide and Conquer |
| 269 | K Items With the Maximum Sum | Easy | MathGreedy |
| 270 | K-th Symbol in Grammar | Medium | MathBit ManipulationRecursion |
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