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Questions and Answers
What principle does a queue follow?
What principle does a queue follow?
What operation removes an element from the front of a queue?
What operation removes an element from the front of a queue?
Which type of queue connects the last part to the first, forming a circular structure?
Which type of queue connects the last part to the first, forming a circular structure?
In a priority queue, how are elements with the same priority handled?
In a priority queue, how are elements with the same priority handled?
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Which operation would you use to check if a queue is empty?
Which operation would you use to check if a queue is empty?
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What is the main characteristic of a dequeue?
What is the main characteristic of a dequeue?
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In a simple queue, where does the insertion occur?
In a simple queue, where does the insertion occur?
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What is the result of removing elements from a priority queue with elements 7, 5, and 3 in that order?
What is the result of removing elements from a priority queue with elements 7, 5, and 3 in that order?
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Which operation retrieves the value of the front of the queue without removing it?
Which operation retrieves the value of the front of the queue without removing it?
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How does a circular queue differ from a linear queue?
How does a circular queue differ from a linear queue?
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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
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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.
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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.
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Double-Ended Queue (Deque): A deque supports insertion and deletion at both ends, making it useful for both queue and stack-like operations.
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Priority Queue: Elements are arranged based on priority. Elements with the same priority are handled using the FIFO principle.
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Input-Restricted Queue: Elements can only be inserted at one end but can be deleted from both ends.
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Output-Restricted Queue: Elements can only be inserted at both ends, but can be deleted from only one end.
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Ascending Priority Queue: Elements are removed based on ascending order of priority.
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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
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Using Arrays: Data is stored in an array, using
frontandrearindices to manage insertion and deletion. -
Using Linked Lists: Nodes with data and pointers are linked to create the queue structure.
frontandrearpointers manage the queue.
Working of a Queue
- Two pointers,
FRONTandREAR, are used to track the front and rear of the queue. -
FRONTpoints to the first element, andREARpoints to the last. - Initially, both
FRONTandREARare set to -1.
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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.
