Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 406 | Construct the Rectangle | Easy | Math |
| 407 | Constructing Two Increasing Arrays | Hard | ArrayDynamic Programming |
| 408 | Contain Virus | Hard | ArrayDepth-First SearchBreadth-First Search |
| 409 | Container With Most Water | Medium | ArrayTwo PointersGreedy |
| 410 | Contains Duplicate | Easy | ArrayHash TableSorting |
| 411 | Contains Duplicate II | Easy | ArrayHash TableSliding Window |
| 412 | Contains Duplicate III | Hard | ArraySliding WindowSorting |
| 413 | Contiguous Array | Medium | ArrayHash TablePrefix Sum |
| 414 | Continuous Subarray Sum | Medium | ArrayHash TableMath |
| 415 | Continuous Subarrays | Medium | ArrayQueueSliding Window |
| 416 | Convert 1D Array Into 2D Array | Easy | ArrayMatrixSimulation |
| 417 | Convert a Number to Hexadecimal | Easy | MathStringBit Manipulation |
| 418 | Convert an Array Into a 2D Array With Conditions | Medium | ArrayHash Table |
| 419 | Convert Binary Number in a Linked List to Integer | Easy | Linked ListMath |
| 420 | Convert Binary Search Tree to Sorted Doubly Linked List | Medium | Linked ListStackTree |
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