Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 871 | Evaluate Reverse Polish Notation | Medium | ArrayMathStack |
| 872 | Evaluate the Bracket Pairs of a String | Medium | ArrayHash TableString |
| 873 | Even Odd Tree | Medium | TreeBreadth-First SearchBinary Tree |
| 874 | Event Emitter | Medium | JavaScript |
| 875 | Exam Room | Medium | DesignHeap (Priority Queue)Ordered Set |
| 876 | Excel Sheet Column Number | Easy | MathString |
| 877 | Excel Sheet Column Title | Easy | MathString |
| 878 | Exchange Seats | Medium | Database |
| 879 | Exclusive Time of Functions | Medium | ArrayStack |
| 880 | Execute Asynchronous Functions in Parallel | Medium | JavaScript |
| 881 | Execution of All Suffix Instructions Staying in a Grid | Medium | StringSimulation |
| 882 | Existence of a Substring in a String and Its Reverse | Easy | Hash TableString |
| 883 | Expression Add Operators | Hard | MathStringBacktracking |
| 884 | Expressive Words | Medium | ArrayTwo PointersString |
| 885 | Extra Characters in a String | Medium | ArrayHash TableString |
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