Practice problems across 75+ categories
Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Find the Most Competitive Subsequence | Medium | ArrayStackGreedy |
| 62 | Find the Number of Subarrays Where Boundary Elements Are Maximum | Hard | ArrayBinary SearchStack |
| 63 | Finding the Number of Visible Mountains | Medium | ArrayStackSorting |
| 64 | Flatten Binary Tree to Linked List | Medium | Linked ListStackTree |
| 65 | Flatten Nested List Iterator | Medium | StackTreeDepth-First Search |
| 66 | Implement Queue using Stacks | Easy | StackDesignQueue |
| 67 | Implement Stack using Queues | Easy | StackDesignQueue |
| 68 | Increasing Order Search Tree | Easy | StackTreeDepth-First Search |
| 69 | Is Array a Preorder of Some Binary Tree | Medium | StackTreeDepth-First Search |
| 70 | Jump Game VIII | Medium | ArrayDynamic ProgrammingStack |
| 71 | Largest Rectangle in Histogram | Hard | ArrayStackMonotonic Stack |
| 72 | Lexicographically Minimum String After Removing Stars | Medium | Hash TableStringStack |
| 73 | Longest Absolute File Path | Medium | StringStackDepth-First Search |
| 74 | Longest Valid Parentheses | Hard | StringDynamic ProgrammingStack |
| 75 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
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