Data Structures: Queues Overview
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Questions and Answers

What principle does a queue follow?

  • Last In Last Out
  • First In Last Out
  • Last In First Out
  • First In First Out (correct)

    • What operation removes an element from the front of a queue?

  • Peek
  • Dequeue (correct)
  • Enqueue
  • IsEmpty

    • Which type of queue connects the last part to the first, forming a circular structure?

  • Priority Queue
  • Circular Queue (correct)
  • Linear Queue
  • Simple Queue

    • In a priority queue, how are elements with the same priority handled?

    <p>They are sorted using FIFO principle. (D)</p> Signup and view all the answers

    Which operation would you use to check if a queue is empty?

    <p>IsEmpty (A)</p> Signup and view all the answers

    What is the main characteristic of a dequeue?

    <p>Allows insertion and deletion at both ends. (A)</p> Signup and view all the answers

    In a simple queue, where does the insertion occur?

    <p>At the back end (C)</p> Signup and view all the answers

    What is the result of removing elements from a priority queue with elements 7, 5, and 3 in that order?

    <p>3, 5, 7 (A)</p> Signup and view all the answers

    Which operation retrieves the value of the front of the queue without removing it?

    <p>Peek (B)</p> Signup and view all the answers

    How does a circular queue differ from a linear queue?

    <p>It connects its end back to the front. (D)</p> Signup and view all the answers

    Flashcards

    What is a Queue?

    A linear data structure where elements are added at one end (rear) and removed from the other end (front). Elements are processed in the order they were added, following the First In First Out (FIFO) principle.

    Enqueue

    Adding a new element to the end of the queue (rear).

    Dequeue

    Removing an element from the front of the queue.

    IsEmpty

    Checks if the queue is empty (no elements).

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    Peek

    Retrieving the value of the element at the front of the queue without removing it.

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    Dequeue (Double-Ended Queue)

    A queue that inserts and deletes elements from opposite ends, allowing both FIFO and LIFO behavior.

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    Linear Queue

    A simple queue where elements are added at the rear and removed from the front, following FIFO.

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    Circular Queue

    A queue where the last element is connected to the first, forming a circular arrangement.

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    Priority Queue

    Elements are prioritized based on their importance, with higher priority elements being processed first.

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    How does FIFO apply in a Priority Queue?

    Elements are inserted at the rear and removed from the front, but elements with the same priority are processed in FIFO order.

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    Study Notes

    Queues

    • A queue is a linear data structure that follows the FIFO (First-In, First-Out) principle.
    • Queues have two ends: elements are added at one end (rear) and removed from the other end (front).
    • The element added first is also removed first.
    • Insertion operations are performed at the rear.
    • Deletion operations are performed at the front.

    Types of Queues

    • Simple Queue (or Linear Queue): Elements are inserted at the rear and deleted from the front. Insertion occurs at the back/rear end, while deletion occurs at the front end.

    • Circular Queue: A circular queue is similar to a linear queue, but the last element is connected to the first, forming a ring. Also known as a ring buffer.

    • Double-Ended Queue (Deque): A deque supports insertion and deletion at both ends, making it useful for both queue and stack-like operations.

    • Priority Queue: Elements are arranged based on priority. Elements with the same priority are handled using the FIFO principle.

    • Input-Restricted Queue: Elements can only be inserted at one end but can be deleted from both ends.

    • Output-Restricted Queue: Elements can only be inserted at both ends, but can be deleted from only one end.

    • Ascending Priority Queue: Elements are removed based on ascending order of priority.

    • Descending Priority Queue: Elements are removed based on descending order of priority.

    Operations on a Queue

    • Enqueue: Adds an element to the end of the queue.
    • Dequeue: Removes an element from the front of the queue.
    • IsEmpty: Checks if the queue is empty.
    • Peek: Returns the value of the front element without removing it.
    • Size: Returns the number of elements in the queue.

    Implementation

    • Using Arrays: Data is stored in an array, using front and rear indices to manage insertion and deletion.

    • Using Linked Lists: Nodes with data and pointers are linked to create the queue structure. front and rear pointers manage the queue.

    Working of a Queue

    • Two pointers, FRONT and REAR, are used to track the front and rear of the queue.
    • FRONT points to the first element, and REAR points to the last.
    • Initially, both FRONT and REAR are set to -1.

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    Related Documents

    Queues Data Structures Tutorial PDF

    Description

    This quiz covers the fundamentals of queues, a key linear data structure that operates on the FIFO principle. Learn about the various types of queues, including simple queues, circular queues, double-ended queues, and priority queues. Test your understanding and application of these concepts in programming.

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