Practice problems across 75+ categories
Practice problems frequently asked at Math • 596 problems | 150 Easy | 283 Medium | 161 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 466 | Random Flip Matrix | Medium | Hash TableMathReservoir Sampling |
| 467 | Random Pick Index | Medium | Hash TableMathReservoir Sampling |
| 468 | Random Pick with Blacklist | Hard | ArrayHash TableMath |
| 469 | Random Pick with Weight | Medium | ArrayMathBinary Search |
| 470 | Random Point in Non-overlapping Rectangles | Medium | ArrayMathBinary Search |
| 471 | Range Addition II | Easy | ArrayMath |
| 472 | Reach a Number | Medium | MathBinary Search |
| 473 | Reaching Points | Hard | Math |
| 474 | Reconstruct Original Digits from English | Medium | Hash TableMathString |
| 475 | Rectangle Area | Medium | MathGeometry |
| 476 | Rectangle Overlap | Easy | MathGeometry |
| 477 | Remove 9 | Hard | Math |
| 478 | Remove All Ones With Row and Column Flips | Medium | ArrayMathBit Manipulation |
| 479 | Remove Colored Pieces if Both Neighbors are the Same Color | Medium | MathStringGreedy |
| 480 | Reordered Power of 2 | Medium | Hash TableMathSorting |
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