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

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Question 1

In a circular queue implemented with an array of size 5, if front = 2 and rear = 4, what will be the new values of front and rear after two dequeue operations, followed by one enqueue operation?

front = 0, rear = 1
front = 3, rear = 0
front = 4, rear = 0
front = 1, rear = 2

Question 2

Consider a circular queue implemented using an array. If the front is at index 5 and the rear is at index 2 (with a valid queue configuration), what is the current size of the queue (assuming the array has a capacity greater than the queue size)?

Cannot be determined with the given information
4
7
3

Question 3

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

Question 4

What is a potential drawback of implementing a queue using a fixed-size array?

Difficulty in searching for specific elements within the queue
Higher memory usage compared to a linked list implementation
The inability to handle a queue size exceeding the array's capacity
Increased time complexity for enqueue and dequeue operations

Question 5

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?

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

Question 6

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

Question 7

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

Question 8

In the context of operating systems, which of the following is a common use case for a queue?

Storing frequently accessed data for faster retrieval
Managing the order of function calls in a program
Maintaining the order of packets in a network router
Scheduling processes for execution by the CPU

Question 9

How does the time complexity of adding or removing an element from the front of a deque compare to doing the same at the back?

Adding or removing from the front is always faster.
Adding or removing from either end has the same time complexity, which is typically O(1).
Adding or removing from the back is always faster.
The time complexity depends on the specific implementation of the deque.

Question 10

In what scenario would using a deque NOT provide a significant performance advantage over a regular queue?

When implementing a job scheduling queue with different priority levels
When processing a stream of data in a First-In, First-Out (FIFO) manner
When elements need to be added and removed from both ends frequently
When implementing a Least Recently Used (LRU) cache with a fixed size

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Question 1

In a circular queue implemented with an array of size 5, if front = 2 and rear = 4, what will be the new values of front and rear after two dequeue operations, followed by one enqueue operation?

front = 0, rear = 1
front = 3, rear = 0
front = 4, rear = 0
front = 1, rear = 2

Question 2

Cannot be determined with the given information
4
7
3

Question 3

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

Question 4

What is a potential drawback of implementing a queue using a fixed-size array?

Difficulty in searching for specific elements within the queue
Higher memory usage compared to a linked list implementation
The inability to handle a queue size exceeding the array's capacity
Increased time complexity for enqueue and dequeue operations

Question 5

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

Question 6

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

Question 7

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

Question 8

In the context of operating systems, which of the following is a common use case for a queue?

Storing frequently accessed data for faster retrieval
Managing the order of function calls in a program
Maintaining the order of packets in a network router
Scheduling processes for execution by the CPU

Question 9

How does the time complexity of adding or removing an element from the front of a deque compare to doing the same at the back?

Adding or removing from the front is always faster.
Adding or removing from either end has the same time complexity, which is typically O(1).
Adding or removing from the back is always faster.
The time complexity depends on the specific implementation of the deque.

Question 10

In what scenario would using a deque NOT provide a significant performance advantage over a regular queue?

When implementing a job scheduling queue with different priority levels
When processing a stream of data in a First-In, First-Out (FIFO) manner
When elements need to be added and removed from both ends frequently
When implementing a Least Recently Used (LRU) cache with a fixed size

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