Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 856 | Equal Row and Column Pairs | Medium | ArrayHash TableMatrix |
| 857 | Equal Sum Arrays With Minimum Number of Operations | Medium | ArrayHash TableGreedy |
| 858 | Equal Sum Grid Partition I | Medium | ArrayMatrixEnumeration |
| 859 | Equal Tree Partition | Medium | TreeDepth-First SearchBinary Tree |
| 860 | Equalize Strings by Adding or Removing Characters at Ends | Medium | StringBinary SearchDynamic Programming |
| 861 | Erect the Fence | Hard | ArrayMathGeometry |
| 862 | Erect the Fence II | Hard | ArrayMathGeometry |
| 863 | Escape a Large Maze | Hard | ArrayHash TableDepth-First Search |
| 864 | Escape The Ghosts | Medium | ArrayMath |
| 865 | Evaluate Boolean Binary Tree | Easy | TreeDepth-First SearchBinary Tree |
| 866 | Evaluate Boolean Expression | Medium | Database |
| 867 | Evaluate Division | Medium | ArrayStringDepth-First Search |
| 868 | Evaluate Reverse Polish Notation | Medium | ArrayMathStack |
| 869 | Evaluate the Bracket Pairs of a String | Medium | ArrayHash TableString |
| 870 | Even Odd Tree | Medium | TreeBreadth-First SearchBinary Tree |
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