Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 631 | Finding 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 632 | Finding Pairs With a Certain Sum | Medium | ArrayHash TableDesign |
| 633 | Finding the Number of Visible Mountains | Medium | ArrayStackSorting |
| 634 | Finding the Users Active Minutes | Medium | ArrayHash Table |
| 635 | First Completely Painted Row or Column | Medium | ArrayHash TableMatrix |
| 636 | First Day Where You Have Been in All the Rooms | Medium | ArrayDynamic Programming |
| 637 | First Missing Positive | Hard | ArrayHash Table |
| 638 | First Unique Number | Medium | ArrayHash TableDesign |
| 639 | Fixed Point | Easy | ArrayBinary Search |
| 640 | Flatten 2D Vector | Medium | ArrayTwo PointersDesign |
| 641 | Flip Columns For Maximum Number of Equal Rows | Medium | ArrayHash TableMatrix |
| 642 | Flipping an Image | Easy | ArrayTwo PointersBit Manipulation |
| 643 | Flood Fill | Easy | ArrayDepth-First SearchBreadth-First Search |
| 644 | Form Array by Concatenating Subarrays of Another Array | Medium | ArrayTwo PointersGreedy |
| 645 | Form Largest Integer With Digits That Add up to Target | Hard | ArrayDynamic Programming |
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