Practice problems across 75+ categories
Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Clumsy Factorial | Medium | MathStackSimulation |
| 32 | Command Pattern Calculator | Medium | OOP DesignDesign PatternStack |
| 33 | Construct Binary Search Tree from Preorder Traversal | Medium | ArrayStackTree |
| 34 | Construct Binary Tree from String | Medium | StringStackTree |
| 35 | Construct Smallest Number From DI String | Medium | StringBacktrackingStack |
| 36 | Convert Binary Search Tree to Sorted Doubly Linked List | Medium | Linked ListStackTree |
| 37 | Count Collisions on a Road | Medium | StringStackSimulation |
| 38 | Count Non-Decreasing Subarrays After K Operations | Hard | ArrayStackSegment Tree |
| 39 | Count Submatrices With All Ones | Medium | ArrayDynamic ProgrammingStack |
| 40 | Crawler Log Folder | Easy | ArrayStringStack |
| 41 | Create Maximum Number | Hard | ArrayTwo PointersStack |
| 42 | Daily Temperatures | Medium | ArrayStackMonotonic Stack |
| 43 | Decode String | Medium | StringStackRecursion |
| 44 | Decoded String at Index | Medium | StringStack |
| 45 | Design a Stack With Increment Operation | Medium | ArrayStackDesign |
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