Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3316 | Users With Two Purchases Within Seven Days | Medium | Database |
| 3317 | Using a Robot to Print the Lexicographically Smallest String | Medium | Hash TableStringStack |
| 3318 | UTF-8 Validation | Medium | ArrayBit Manipulation |
| 3319 | Valid Anagram | Easy | Hash TableStringSorting |
| 3320 | Valid Arrangement of Pairs | Hard | Depth-First SearchGraphEulerian Circuit |
| 3321 | Valid Boomerang | Easy | ArrayMathGeometry |
| 3322 | Valid Mountain Array | Easy | Array |
| 3323 | Valid Number | Hard | String |
| 3324 | Valid Palindrome | Easy | Two PointersString |
| 3325 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 3326 | Valid Palindrome III | Hard | StringDynamic Programming |
| 3327 | Valid Palindrome IV | Medium | Two PointersString |
| 3328 | Valid Parentheses | Easy | StringStack |
| 3329 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| 3330 | Valid Perfect Square | Easy | MathBinary Search |
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