Prepare for Queue Data Structure Interview with iQwizz | Difficulty Level: Advance | Rating: 4.2

Please login before attempting the quiz

Question 1

You need to implement a queue with the following operations: enqueue, dequeue, and find the minimum element in the queue in O(1) time complexity. Which data structure would be most efficient for this scenario?

A queue and a stack
Two queues
A queue and a min-heap
A single queue

Question 2

Which of the following algorithms does NOT inherently rely on a queue data structure?

Level order traversal of a binary tree
Breadth-first search
Dijkstra's shortest path algorithm
Depth-first search

Question 3

You are building a system to manage a print queue for a network printer. Multiple computers can send print jobs (represented as objects) to the queue. Which feature of a deque would be MOST beneficial for allowing users to prioritize urgent print jobs?

Constant time complexity for accessing the last element (back())
The ability to iterate through the deque in reverse order
Random access to elements in the deque
The ability to insert elements at the front (push_front())

Question 4

In a circular queue implemented using an array of size N, how many elements can the queue hold at any given time?

N + 1
It depends on the data type of the elements
N
N - 1

Question 5

Which queue implementation is generally preferred when you need to prioritize elements based on certain criteria, leading to elements being dequeued out of their standard FIFO order?

None of the above
Array-based queue
Circular queue
Linked list-based queue

Question 6

Imagine you need to design a system for handling requests with different priority levels. High-priority requests should be processed before lower-priority ones. Which queue implementation would be best suited for this scenario?

A priority queue
A circular queue
A LIFO queue (stack)
A standard FIFO queue

Question 7

Imagine you need to implement a system that keeps track of the last N requests made to a server, along with their timestamps. This data is used for monitoring and analyzing recent server activity. Which deque operation would be MOST frequently used for maintaining this sliding window of requests?

front()
push_back()
pop_front()
push_front()

Question 8

You are designing a text editor with an undo/redo functionality. You want to store the history of operations efficiently, allowing the user to undo and redo actions in any order. Which data structure, built using deques, is best suited for this scenario?

A deque of deques, where each inner deque represents a state of the text editor
A deque is not suitable for this scenario
A single deque where undo operations are stored at the front and redo operations at the back
Two separate deques, one for undo and one for redo

Question 9

What is a significant disadvantage of implementing a queue using a single linked list compared to a doubly linked list?

Inability to perform efficient dequeue operations
More complex implementation logic
Slower enqueue operations as the tail needs to be traversed
Increased memory usage due to the extra 'next' pointer

Question 10

Consider two queues: Q1 implemented using a singly linked list and Q2 implemented using a circular array. Both queues currently hold n elements. What is the difference in time complexity for dequeuing all elements from Q1 and Q2?

Both have the same time complexity, O(n)
Q1 has O(n) complexity, Q2 has O(n^2) complexity
Q1 has O(n) complexity, Q2 has O(1) complexity
Q1 has O(n^2) complexity, Q2 has O(n) complexity

Please login before attempting the quiz

Question 1

A queue and a stack
Two queues
A queue and a min-heap
A single queue

Question 2

Which of the following algorithms does NOT inherently rely on a queue data structure?

Level order traversal of a binary tree
Breadth-first search
Dijkstra's shortest path algorithm
Depth-first search

Question 3

Constant time complexity for accessing the last element (back())
The ability to iterate through the deque in reverse order
Random access to elements in the deque
The ability to insert elements at the front (push_front())

Question 4

In a circular queue implemented using an array of size N, how many elements can the queue hold at any given time?

N + 1
It depends on the data type of the elements
N
N - 1

Question 5

Which queue implementation is generally preferred when you need to prioritize elements based on certain criteria, leading to elements being dequeued out of their standard FIFO order?

None of the above
Array-based queue
Circular queue
Linked list-based queue

Question 6

A priority queue
A circular queue
A LIFO queue (stack)
A standard FIFO queue

Question 7

front()
push_back()
pop_front()
push_front()

Question 8

A deque of deques, where each inner deque represents a state of the text editor
A deque is not suitable for this scenario
A single deque where undo operations are stored at the front and redo operations at the back
Two separate deques, one for undo and one for redo

Question 9

What is a significant disadvantage of implementing a queue using a single linked list compared to a doubly linked list?

Inability to perform efficient dequeue operations
More complex implementation logic
Slower enqueue operations as the tail needs to be traversed
Increased memory usage due to the extra 'next' pointer

Question 10

Both have the same time complexity, O(n)
Q1 has O(n) complexity, Q2 has O(n^2) complexity
Q1 has O(n) complexity, Q2 has O(1) complexity
Q1 has O(n^2) complexity, Q2 has O(n) complexity

Queue Data Structure Questions

Please login before attempting the quiz

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Please login before attempting the quiz

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Login Account