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Stacks interview questions

Stacks interview questions.

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  • 1.

    Explain why Stack is a recursive data structure

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  • 2.

    What is Stack?

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  • 3.

    Why and when should I use Stack or Queue data structures instead of Arrays/Lists?

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  • 4.

    Why Are Stacks Useful?

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  • 5.

    How to implement Linked List Using Stack?

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  • 6.

    Implement a Queue using two Stacks

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  • 7.

    Implement Stack using Two Queues (with efficient push)

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  • 8.

    What is complexity of push and pop for a Stack implemented using a LinkedList?

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  • 9.

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

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  • 10.

    Reverse a String using Stack

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  • 11.

    Compare Array based vs Linked List stack implementations

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  • 12.

    Explain what are Infix, Prefix and Postfix Expressions?

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  • 13.

    Implement Double Linked List from Stack with min complexity

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  • 14.

    Sort a Stack using another Stack

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  • 15.

    Check if parentheses are balanced using Stack

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  • 16.

    How reverse Stack without using any (extra) data structure?

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  • 17.

    Find duplicate parenthesis in expression

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  • 18.

    Sort a Stack using Recursion

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  • 19.

    How do I convert a Queue into the Stack?

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  • 20.

    Why do we need Prefix and Postfix notations?

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  • 21.

    How implement a Queue using only One (1) Stack?

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  • 22.

    How to implement 3 Stacks with one Array?

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  • 23.

    Given an extremely large file that contains parenthesis, how would you say that the parenthesis are balanced?

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  • 24.

    Build a Binary Expression Tree for this expression

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  • 25.

    How to check for braces balance in a really large (1T) file in parallel?

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