Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3811 | Users With Two Purchases Within Seven Days | Medium | Database |
| 3812 | Using a Robot to Print the Lexicographically Smallest String | Medium | Hash TableStringStack |
| 3813 | UTF-8 Validation | Medium | ArrayBit Manipulation |
| 3814 | Valid Anagram | Easy | Hash TableStringSorting |
| 3815 | Valid Arrangement of Pairs | Hard | Depth-First SearchGraphEulerian Circuit |
| 3816 | Valid Boomerang | Easy | ArrayMathGeometry |
| 3817 | Valid Mountain Array | Easy | Array |
| 3818 | Valid Number | Hard | String |
| 3819 | Valid Palindrome | Easy | Two PointersString |
| 3820 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 3821 | Valid Palindrome III | Hard | StringDynamic Programming |
| 3822 | Valid Palindrome IV | Medium | Two PointersString |
| 3823 | Valid Parentheses | Easy | StringStack |
| 3824 | Valid Parenthesis String | Medium | StringDynamic ProgrammingStack |
| 3825 | Valid Perfect Square | Easy | MathBinary Search |
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