Practice problems across 75+ categories
Practice problems frequently asked at Math • 596 problems | 150 Easy | 283 Medium | 161 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 406 | Number of Common Factors | Easy | MathEnumerationNumber Theory |
| 407 | Number Of Corner Rectangles | Medium | ArrayMathDynamic Programming |
| 408 | Number of Days Between Two Dates | Easy | MathString |
| 409 | Number of Days in a Month | Easy | Math |
| 410 | Number of Different Subsequences GCDs | Hard | ArrayMathCounting |
| 411 | Number of Digit One | Hard | MathDynamic ProgrammingRecursion |
| 412 | Number of Distinct Binary Strings After Applying Operations | Medium | MathString |
| 413 | Number of Good Pairs | Easy | ArrayHash TableMath |
| 414 | Number of Laser Beams in a Bank | Medium | ArrayMathString |
| 415 | Number of Music Playlists | Hard | MathDynamic ProgrammingCombinatorics |
| 416 | Number of Pairs of Interchangeable Rectangles | Medium | ArrayHash TableMath |
| 417 | Number of Self-Divisible Permutations | Medium | ArrayMathDynamic Programming |
| 418 | Number of Sets of K Non-Overlapping Line Segments | Medium | MathDynamic ProgrammingCombinatorics |
| 419 | Number of Single Divisor Triplets | Medium | Math |
| 420 | Number of Smooth Descent Periods of a Stock | Medium | ArrayMathTwo Pointers |
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