Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3286 | Two Sum IV - Input is a BST | Unknown | Hash TableTwo PointersTree |
| 3287 | Two Sum Less Than K | Easy | ArrayTwo PointersBinary Search |
| 3288 | Type of Triangle | Easy | ArrayMathSorting |
| 3289 | Ugly Number | Easy | Math |
| 3290 | Ugly Number II | Medium | Hash TableMathDynamic Programming |
| 3291 | Ugly Number III | Medium | MathBinary SearchCombinatorics |
| 3292 | Uncommon Words from Two Sentences | Easy | Hash TableStringCounting |
| 3293 | Uncrossed Lines | Medium | ArrayDynamic Programming |
| 3294 | Undefined to Null | Medium | JavaScript |
| 3295 | Unique 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 3296 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 3297 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 3298 | Unique Email Addresses | Easy | ArrayHash TableString |
| 3299 | Unique Length-3 Palindromic Subsequences | Medium | Hash TableStringBit Manipulation |
| 3300 | Unique Morse Code Words | Easy | ArrayHash TableString |
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