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

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Question 1

In a backtracking algorithm, what does the act of popping an element from the stack signify?

Backtracking to a previous state
Finding the solution
Exploring a new path
Storing a potential candidate

Question 2

Which of the following is a significant drawback of implementing a stack using a static array?

Fixed size limitation
Slow push and pop operations
Complex implementation
High memory usage

Question 3

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

Question 4

What real-world scenario accurately reflects the functioning of a stack?

Books arranged alphabetically on a shelf
Customers waiting on hold for customer service
People standing in a queue at a ticket counter
Cars parked in a single-lane driveway

Question 5

What is the primary disadvantage of using stacks compared to other data structures?

Limited access to elements (only top)
High memory consumption
Inability to store duplicate elements
Slow insertion and deletion at the end

Question 6

What value does the 'peek' operation return if the stack is empty?

-1
It depends on the implementation.
null
0

Question 7

What is the space complexity of a stack that stores n integers?

O(log n)
O(1)
O(n)
O(n^2)

Question 8

In a stack, how is the element that was added before the last added element accessed?

By popping the top element first.
Directly using its index.
By searching the entire stack sequentially.
It's not possible to access elements directly in a stack.

Question 9

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

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

Question 10

In the context of a dynamic array-based stack, what does amortized analysis help us determine?

The average time complexity of push operations over a sequence of operations
The maximum time complexity of a single push operation
The minimum space used by the stack
The exact number of array resizes

Please login before attempting the quiz

Question 1

In a backtracking algorithm, what does the act of popping an element from the stack signify?

Backtracking to a previous state
Finding the solution
Exploring a new path
Storing a potential candidate

Question 2

Which of the following is a significant drawback of implementing a stack using a static array?

Fixed size limitation
Slow push and pop operations
Complex implementation
High memory usage

Question 3

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

Question 4

What real-world scenario accurately reflects the functioning of a stack?

Books arranged alphabetically on a shelf
Customers waiting on hold for customer service
People standing in a queue at a ticket counter
Cars parked in a single-lane driveway

Question 5

What is the primary disadvantage of using stacks compared to other data structures?

Limited access to elements (only top)
High memory consumption
Inability to store duplicate elements
Slow insertion and deletion at the end

Question 6

What value does the 'peek' operation return if the stack is empty?

-1
It depends on the implementation.
null
0

Question 7

What is the space complexity of a stack that stores n integers?

O(log n)
O(1)
O(n)
O(n^2)

Question 8

In a stack, how is the element that was added before the last added element accessed?

By popping the top element first.
Directly using its index.
By searching the entire stack sequentially.
It's not possible to access elements directly in a stack.

Question 9

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

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

Question 10

In the context of a dynamic array-based stack, what does amortized analysis help us determine?

The average time complexity of push operations over a sequence of operations
The maximum time complexity of a single push operation
The minimum space used by the stack
The exact number of array resizes

Stacks Data Structure Questions

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