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Explore our carefully curated catalog of interview essentials covering full-stack, data structures and alogithms, system design, data science, and machine learning interview questions

Stacks

46 Stacks interview questions

Only coding challenges
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Stack Fundamentals


  • 1.

    What is a Stack?

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  • 2.

    Why Stack is considered a Recursive data structure?

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  • 3.

    What are the primary operations performed on a Stack and their time complexities?

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Stack Usage and Applications


  • 4.

    When should I use Stack or Queue data structures instead of Arrays/Lists?

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  • 5.

    What are Infix, Prefix, and Postfix notations?

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  • 6.

    Explain how Stacks are used in Function Call management in programming languages.

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  • 7.

    Describe an application where Stacks are naturally suited over other data structures.

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Stack Implementation Details


  • 8.

    Compare Array-based vs Linked List stack implementations.

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  • 9.

    Implement a Dynamic Stack that automatically resizes itself.

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  • 10.

    What are the performance implications of a Fixed-size Array Stack Implementation?

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Stack Design Challenges


  • 11.

    Design a Stack that supports Retrieving the min element in O(1).

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  • 12.

    How can you design a Stack to be thread-safe?

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  • 13.

    Implement a Stack with a Find-Middle operation in O(1) time.

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Stack and Other Data Structures


  • 14.

    Implement a Linked List using Stack.

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  • 15.

    Implement Doubly Linked List using Stacks with min complexity.

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  • 16.

    Implement a Queue using Two Stacks.

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  • 17.

    Implement a Queue using only One Stack.

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  • 18.

    Implement Stack using Two Queues with efficient push.

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  • 19.

    Implement Three Stacks with One Array.

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Stack Manipulation and Variation


  • 20.

    Reverse a String using Stack.

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  • 21.

    Reverse a Stack without using any additional data structure.

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  • 22.

    Sort a Stack using Recursion.

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  • 23.

    Sort a Stack using another Stack.

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  • 24.

    Implement a Shuffling Algorithm using a Stack.

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Stack in Parsing and Expression Evaluation


  • 25.

    Check if parentheses are Balanced using Stack.

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  • 26.

    Find Duplicate Parenthesis in an expression.

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  • 27.

    How can a Stack be used to evaluate Postfix expressions?

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  • 28.

    Convert an Infix expression to Postfix using a Stack.

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  • 29.

    Build a Binary Expression Tree for the given expression.

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Handling Large Datasets with Stack


  • 30.

    Given an Extremely Large File that doesn’t fit into memory, check if the parentheses are Balanced.

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  • 31.

    Check for Braces Balance in a really large (1T) file in Parallel.

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  • 32.

    Design a script to process large-scale, real-time Undo Operations using Stacks.

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  • 33.

    How would a Stack handle Memory Allocation in large data scenarios?

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Advanced Stack Problems


  • 34.

    Solve the Stock Span Problem using a Stack.

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  • 35.

    Design an algorithm to Calculate Rainwater Trapped between towers using a Stack.

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Stack Performance Optimization


  • 36.

    Explain how to minimize Stack Overflow in programming with limited memory.

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  • 37.

    What techniques can be used to improve the Locality of reference for a Stack?

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Stacks in Multithreading and Concurrency


  • 38.

    Describe a Lock-free Stack and where it may be used.

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  • 39.

    Illustrate how a Stack can be used in implementing Producer-Consumer scenarios.

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Stack Invariants and Monitoring


  • 40.

    Propose a method to maintain a History of Operations on a Stack.

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  • 41.

    How might you design a monitoring system for Capacity Thresholds of a Stack?

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Stack Error Handling and Exceptions


  • 42.

    Explain how a Stack Trace is used in debugging and exception handling.

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  • 43.

    What methods exist to handle Stack Overflow Exceptions in memory-constrained environments?

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Stack Algorithm Challenges


  • 44.

    Create an algorithm to Normalize Pathnames using a Stack.

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  • 45.

    Implement a function that finds the Next Greater Element using a Stack.

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  • 46.

    Develop an algorithm to check for Cycles in a Directed Graph using Stack-based DFS.

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