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 Squareful Arrays | Hard | ArrayHash TableMath |
| 407 | Number of Steps to Reduce a Number to Zero | Easy | MathBit Manipulation |
| 408 | Number of Strings Which Can Be Rearranged to Contain Substring | Medium | MathDynamic ProgrammingCombinatorics |
| 409 | Number of Sub-arrays With Odd Sum | Medium | ArrayMathDynamic Programming |
| 410 | Number of Subarrays Having Even Product | Medium | ArrayMathDynamic Programming |
| 411 | Number of Subarrays With GCD Equal to K | Medium | ArrayMathNumber Theory |
| 412 | Number of Subarrays With LCM Equal to K | Medium | ArrayMathNumber Theory |
| 413 | Number of Subsequences with Odd Sum | Medium | ArrayMathDynamic Programming |
| 414 | Number of Substrings With Fixed Ratio | Medium | Hash TableMathString |
| 415 | Number of Substrings With Only 1s | Medium | MathString |
| 416 | Number of Unique XOR Triplets I | Medium | ArrayMathBit Manipulation |
| 417 | Number of Unique XOR Triplets II | Medium | ArrayMathBit Manipulation |
| 418 | Number of Ways to Assign Edge Weights I | Medium | MathTreeDepth-First Search |
| 419 | Number of Ways to Assign Edge Weights II | Hard | ArrayMathDynamic Programming |
| 420 | Number of Ways to Build House of Cards | Medium | MathDynamic Programming |
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