Practice problems across 75+ categories
Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 46 | Design a Text Editor | Hard | Linked ListStringStack |
| 47 | Design an Expression Tree With Evaluate Function | Medium | ArrayMathStack |
| 48 | Design Browser History | Medium | ArrayLinked ListStack |
| 49 | Design Video Sharing Platform | Hard | Hash TableStackDesign |
| 50 | Dinner Plate Stacks | Hard | Hash TableStackDesign |
| 51 | Double a Number Represented as a Linked List | Medium | Linked ListMathStack |
| 52 | Evaluate Reverse Polish Notation | Medium | ArrayMathStack |
| 53 | Exclusive Time of Functions | Medium | ArrayStack |
| 54 | Expression Evaluator | Easy | Data StructuresStackParsing |
| 55 | Final Prices With a Special Discount in a Shop | Easy | ArrayStackMonotonic Stack |
| 56 | Find Building Where Alice and Bob Can Meet | Hard | ArrayBinary SearchStack |
| 57 | Find Maximum Non-decreasing Array Length | Hard | ArrayBinary SearchDynamic Programming |
| 58 | Find Mirror Score of a String | Medium | Hash TableStringStack |
| 59 | Find Permutation | Medium | ArrayStringStack |
| 60 | Find Sorted Submatrices With Maximum Element at Most K | Hard | ArrayStackMatrix |
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