Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 721 | Encrypt and Decrypt Strings | Hard | ArrayHash TableString |
| 722 | Equal Rational Numbers | Hard | MathString |
| 723 | Equal Row and Column Pairs | Medium | ArrayHash TableMatrix |
| 724 | Equal Sum Arrays With Minimum Number of Operations | Medium | ArrayHash TableGreedy |
| 725 | Equal Sum Grid Partition I | Medium | ArrayMatrixEnumeration |
| 726 | Equal Tree Partition | Medium | TreeDepth-First SearchBinary Tree |
| 727 | Equalize Strings by Adding or Removing Characters at Ends | Medium | StringBinary SearchDynamic Programming |
| 728 | Erect the Fence | Hard | ArrayMathGeometry |
| 729 | Erect the Fence II | Hard | ArrayMathGeometry |
| 730 | Escape The Ghosts | Medium | ArrayMath |
| 731 | Evaluate Boolean Binary Tree | Easy | TreeDepth-First SearchBinary Tree |
| 732 | Evaluate Boolean Expression | Medium | Database |
| 733 | Evaluate Reverse Polish Notation | Medium | ArrayMathStack |
| 734 | Evaluate the Bracket Pairs of a String | Medium | ArrayHash TableString |
| 735 | Even Odd Tree | Medium | TreeBreadth-First SearchBinary Tree |
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