Prepare for Stacks Data Structure Interview with iQwizz | Difficulty Level: Beginner | Rating: 4.7

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Question 1

What is the time complexity of pushing an element onto a stack implemented using a static array, assuming there is enough space?

O(n log n)
O(n)
O(1)
O(log n)

Question 2

If you implement a stack using a dynamically allocated array, what is the time complexity of pushing an element in the worst-case scenario if you need to resize the array?

O(n)
O(log n)
O(1)
O(n log n)

Question 3

Which data structure would be most suitable for implementing a Last-In-First-Out (LIFO) access pattern?

Heap
Queue
Deque
Stack

Question 4

Consider the following pseudocode for validating balanced parentheses. What is the function of the 'if' condition inside the loop?

function isBalanced(expression):
 stack = Stack()
 for char in expression:
   if char in ['(', '[', '{']:
     stack.push(char)
   # ... (rest of the code)

Checks if the top of the stack matches the current character.
Checks if the stack is empty.
Checks if the current character is an opening parenthesis.
Checks if the current character is a closing parenthesis.

Question 5

In which scenario would you prefer using a stack over a queue data structure?

Implementing an undo/redo functionality in a text editor.
Managing a print queue where tasks are processed in the order they arrive.
Simulating a first-in, first-out (FIFO) system.
Storing a collection of songs to be played in a shuffled order.

Question 6

In a web browser, navigating back from a webpage utilizes which stack operation?

Peek
Pop
IsEmpty
Push

Question 7

Which of these is NOT a typical application of stacks?

Evaluating mathematical expressions (postfix notation)
Undo/Redo functionality in text editors
Managing function calls in a program's execution
Storing data in a priority-based order

Question 8

How does a stack help in implementing the undo functionality in text editors?

By storing a stack of states.
By storing a queue of actions.
By hashing the content.
By using a linked list of characters.

Question 9

How do stacks and heaps differ in terms of element ordering?

Stack follows LIFO order, while heap maintains a partial ordering
Stack has no specific order, while heap maintains elements in sorted order
Stack follows FIFO order, while heap has no specific order
Both stack and heap maintain elements in sorted order, but with different sorting algorithms

Question 10

You are designing a system to validate arithmetic expressions. Which data structure is most suitable for checking if parentheses '(' '[' '{' are balanced in an expression?

Binary Tree
Queue
Stack
Linked List

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Question 1

What is the time complexity of pushing an element onto a stack implemented using a static array, assuming there is enough space?

O(n log n)
O(n)
O(1)
O(log n)

Question 2

If you implement a stack using a dynamically allocated array, what is the time complexity of pushing an element in the worst-case scenario if you need to resize the array?

O(n)
O(log n)
O(1)
O(n log n)

Question 3

Which data structure would be most suitable for implementing a Last-In-First-Out (LIFO) access pattern?

Heap
Queue
Deque
Stack

Question 4

Consider the following pseudocode for validating balanced parentheses. What is the function of the 'if' condition inside the loop?

function isBalanced(expression):
 stack = Stack()
 for char in expression:
   if char in ['(', '[', '{']:
     stack.push(char)
   # ... (rest of the code)

Checks if the top of the stack matches the current character.
Checks if the stack is empty.
Checks if the current character is an opening parenthesis.
Checks if the current character is a closing parenthesis.

Question 5

In which scenario would you prefer using a stack over a queue data structure?

Implementing an undo/redo functionality in a text editor.
Managing a print queue where tasks are processed in the order they arrive.
Simulating a first-in, first-out (FIFO) system.
Storing a collection of songs to be played in a shuffled order.

Question 6

In a web browser, navigating back from a webpage utilizes which stack operation?

Peek
Pop
IsEmpty
Push

Question 7

Which of these is NOT a typical application of stacks?

Evaluating mathematical expressions (postfix notation)
Undo/Redo functionality in text editors
Managing function calls in a program's execution
Storing data in a priority-based order

Question 8

How does a stack help in implementing the undo functionality in text editors?

By storing a stack of states.
By storing a queue of actions.
By hashing the content.
By using a linked list of characters.

Question 9

How do stacks and heaps differ in terms of element ordering?

Stack follows LIFO order, while heap maintains a partial ordering
Stack has no specific order, while heap maintains elements in sorted order
Stack follows FIFO order, while heap has no specific order
Both stack and heap maintain elements in sorted order, but with different sorting algorithms

Question 10

You are designing a system to validate arithmetic expressions. Which data structure is most suitable for checking if parentheses '(' '[' '{' are balanced in an expression?

Binary Tree
Queue
Stack
Linked List

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