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

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Question 1

What is the time complexity of enqueue and dequeue operations in a well-implemented queue using a linked list?

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

Question 2

In a circular queue implemented using an array of size N, what is the most efficient way to check if the queue is full?

front == 0
front == rear
(rear + 1) % N == front
rear == N - 1

Question 3

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()
pop_front()
push_back()
push_front()

Question 4

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

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

Question 5

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 implementing a Least Recently Used (LRU) cache with a fixed size
When elements need to be added and removed from both ends frequently

Question 6

What type of memory allocation does a linked list-based queue primarily rely on?

Static memory allocation
Direct memory access
Heap allocation
Stack allocation

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

Question 8

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

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

Question 9

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
The ability to insert elements at the front (push_front())
Random access to elements in the deque

Question 10

A palindrome is a word or phrase that reads the same backward as forward. You are tasked with designing an algorithm to check if a given string is a palindrome, ignoring spaces and case. How could a deque be used effectively in your algorithm?

Store the entire string in a deque and compare elements from both ends towards the middle.
Use two deques, one for the original string and one for its reverse, and compare them element by element.
A deque is not a suitable data structure for checking palindromes.
Push each character of the string onto a deque and then pop them off, comparing the popped characters.

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Question 1

What is the time complexity of enqueue and dequeue operations in a well-implemented queue using a linked list?

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

Question 2

In a circular queue implemented using an array of size N, what is the most efficient way to check if the queue is full?

front == 0
front == rear
(rear + 1) % N == front
rear == N - 1

Question 3

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

Question 4

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

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

Question 5

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 implementing a Least Recently Used (LRU) cache with a fixed size
When elements need to be added and removed from both ends frequently

Question 6

What type of memory allocation does a linked list-based queue primarily rely on?

Static memory allocation
Direct memory access
Heap allocation
Stack allocation

Question 7

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

Question 8

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

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

Question 9

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

Question 10

Store the entire string in a deque and compare elements from both ends towards the middle.
Use two deques, one for the original string and one for its reverse, and compare them element by element.
A deque is not a suitable data structure for checking palindromes.
Push each character of the string onto a deque and then pop them off, comparing the popped characters.

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