Podcast
Questions and Answers
What is the primary purpose of the enqueue operation in a queue implemented using a linked list?
What is the primary purpose of the enqueue operation in a queue implemented using a linked list?
- To retrieve the front element of the queue
- To remove an element from the front of the queue
- To add an element to the end of the queue (correct)
- To display all elements in the queue
What happens to the rear pointer during the enqueue operation when the queue is initially empty?
What happens to the rear pointer during the enqueue operation when the queue is initially empty?
- It points to the new node (correct)
- It points to the front node
- It is detached from the new node
- It is set to NULL
What is returned by the peek operation in a queue implemented using a linked list?
What is returned by the peek operation in a queue implemented using a linked list?
- The last element added to the queue
- The total number of elements in the queue
- The element at the front of the queue (correct)
- A temporary copy of the front node
What is a disadvantage of using a circular array for queue implementation compared to a linked list?
What is a disadvantage of using a circular array for queue implementation compared to a linked list?
What occurs in the deQueue operation when the queue becomes empty?
What occurs in the deQueue operation when the queue becomes empty?
What happens to the size of a queue when an element is dequeued?
What happens to the size of a queue when an element is dequeued?
What is the initial value of both front and rear in the queue implementation using an array?
What is the initial value of both front and rear in the queue implementation using an array?
In an enqueue operation, what condition checks if the queue is full?
In an enqueue operation, what condition checks if the queue is full?
What is the defining characteristic of a queue data structure?
What is the defining characteristic of a queue data structure?
What value is returned by the peek operation?
What value is returned by the peek operation?
Which operation would you use to examine the element at the front of a queue?
Which operation would you use to examine the element at the front of a queue?
What occurs when dequeue operation is performed and front equals rear?
What occurs when dequeue operation is performed and front equals rear?
When an element is enqueued for the first time, what values are set for front and rear?
When an element is enqueued for the first time, what values are set for front and rear?
Which real-world scenario can be modeled using a queue?
Which real-world scenario can be modeled using a queue?
What will isEmpty() return if the queue has elements?
What will isEmpty() return if the queue has elements?
What is the maximum size of the queue as defined in the implementation?
What is the maximum size of the queue as defined in the implementation?
What does the queueIsEmpty function check for?
What does the queueIsEmpty function check for?
In which situation would the operation add(value) be used?
In which situation would the operation add(value) be used?
What happens during the dequeue operation of a queue?
What happens during the dequeue operation of a queue?
Which data structure can be used to implement a queue?
Which data structure can be used to implement a queue?
What is the purpose of the isFull() operation in a queue?
What is the purpose of the isFull() operation in a queue?
What happens when a new element is added to a circular array queue when it is full?
What happens when a new element is added to a circular array queue when it is full?
What is the purpose of the queueIsFull()
function?
What is the purpose of the queueIsFull()
function?
In the dequeue operation, what happens when the front and rear pointers are equal?
In the dequeue operation, what happens when the front and rear pointers are equal?
How is the rear
pointer updated when adding an element using the enqueue
operation?
How is the rear
pointer updated when adding an element using the enqueue
operation?
What is the characteristic of using a circular array for queue implementation?
What is the characteristic of using a circular array for queue implementation?
What is the initial value set for both front
and rear
when the queue is first populated?
What is the initial value set for both front
and rear
when the queue is first populated?
Which of the following operations can use the same implementation as regular arrays when using a circular array?
Which of the following operations can use the same implementation as regular arrays when using a circular array?
What is the state of the front
pointer after executing a dequeue operation when the queue contains multiple elements?
What is the state of the front
pointer after executing a dequeue operation when the queue contains multiple elements?
Which operation would be used to remove the front element from a queue?
Which operation would be used to remove the front element from a queue?
In a queue, what happens to the elements as they are dequeued?
In a queue, what happens to the elements as they are dequeued?
Given a queue implemented with an array, which statement is true when an item is enqueued to a full queue?
Given a queue implemented with an array, which statement is true when an item is enqueued to a full queue?
What does the peek operation in a queue accomplish?
What does the peek operation in a queue accomplish?
Which data structure is NOT suitable for implementing a typical queue operation?
Which data structure is NOT suitable for implementing a typical queue operation?
In which scenario would the isEmpty() function return true?
In which scenario would the isEmpty() function return true?
What characteristic distinguishes a queue from other data structures?
What characteristic distinguishes a queue from other data structures?
Choose the statement that describes the enqueue operation.
Choose the statement that describes the enqueue operation.
Which of the following elements would be at the front of the queue after enqueuing the elements 3, 5, and 7 in that order?
Which of the following elements would be at the front of the queue after enqueuing the elements 3, 5, and 7 in that order?
If a queue implemented using an array has reached its maximum size, what would typically happen if another element is enqueued?
If a queue implemented using an array has reached its maximum size, what would typically happen if another element is enqueued?
What occurs to the front pointer during the dequeue operation when there are still elements in the queue?
What occurs to the front pointer during the dequeue operation when there are still elements in the queue?
What is the consequence of trying to enqueue an element when the queue is already full?
What is the consequence of trying to enqueue an element when the queue is already full?
When does the rear pointer get reset to -1 in the dequeue operation?
When does the rear pointer get reset to -1 in the dequeue operation?
During the enqueue operation, what must happen if the queue is empty?
During the enqueue operation, what must happen if the queue is empty?
What is the relationship between the front and rear pointers once the last element has been dequeued?
What is the relationship between the front and rear pointers once the last element has been dequeued?
What does the peek operation return when the queue is empty?
What does the peek operation return when the queue is empty?
In the queue implementation using an array, which condition checks if the queue is empty?
In the queue implementation using an array, which condition checks if the queue is empty?
What happens to the rear pointer in the enqueue operation when the queue already contains elements?
What happens to the rear pointer in the enqueue operation when the queue already contains elements?
How is the size of the queue managed during enqueue operations?
How is the size of the queue managed during enqueue operations?
Which of the following statements is true regarding the peek operation?
Which of the following statements is true regarding the peek operation?
What happens to the rear pointer during an enqueue operation if the front pointer is also at -1?
What happens to the rear pointer during an enqueue operation if the front pointer is also at -1?
What is indicated when the rear pointer reaches MAXSIZE - 1?
What is indicated when the rear pointer reaches MAXSIZE - 1?
What is a primary advantage of using a linked list over a circular array for queue implementation?
What is a primary advantage of using a linked list over a circular array for queue implementation?
When the dequeue operation is performed and the queue becomes empty, what happens to the rear pointer?
When the dequeue operation is performed and the queue becomes empty, what happens to the rear pointer?
Which statement best describes the space efficiency of a linked list used in a queue implementation?
Which statement best describes the space efficiency of a linked list used in a queue implementation?
In the dequeue operation, how is the data of the front node retrieved?
In the dequeue operation, how is the data of the front node retrieved?
What is the state of the queue's front pointer after a successful enqueue operation when the queue was initially empty?
What is the state of the queue's front pointer after a successful enqueue operation when the queue was initially empty?
What happens in a circular array implementation when the queue is full and an attempt to enqueue is made?
What happens in a circular array implementation when the queue is full and an attempt to enqueue is made?
What determines the need for reallocating space in a circular array queue?
What determines the need for reallocating space in a circular array queue?
What happens to the position of the 'rear' pointer in a circular array when a new element is enqueued?
What happens to the position of the 'rear' pointer in a circular array when a new element is enqueued?
In the dequeue operation, what condition indicates that the queue has become empty?
In the dequeue operation, what condition indicates that the queue has become empty?
What will the queueIsFull() function return if the rear pointer is at the last index of the array and there are no other empty spaces?
What will the queueIsFull() function return if the rear pointer is at the last index of the array and there are no other empty spaces?
What is a primary advantage of using a circular array for queue implementation compared to a fixed array?
What is a primary advantage of using a circular array for queue implementation compared to a fixed array?
Which of the following is true about the implementation of the isEmpty operation in a circular array queue?
Which of the following is true about the implementation of the isEmpty operation in a circular array queue?
What is the initial state of both the front and rear pointers when first initializing a circular queue?
What is the initial state of both the front and rear pointers when first initializing a circular queue?
During the enqueue operation, what happens if the queue is full when attempting to add a new element?
During the enqueue operation, what happens if the queue is full when attempting to add a new element?
How does the enqueue operation handle the scenario when adding an element to an empty circular queue?
How does the enqueue operation handle the scenario when adding an element to an empty circular queue?
In the context of circular arrays, what operation follows the modification of the front pointer during a dequeue action?
In the context of circular arrays, what operation follows the modification of the front pointer during a dequeue action?
What is the behavior of the 'dequeue' operation in a circular queue when both front and rear point to the same index?
What is the behavior of the 'dequeue' operation in a circular queue when both front and rear point to the same index?
To insert a new node at the end of the list, you first create a new ______.
To insert a new node at the end of the list, you first create a new ______.
If the list is empty, the new node's data will be assigned to the ______.
If the list is empty, the new node's data will be assigned to the ______.
When inserting at a specific position, you need to update the pointer ‘______’ to point to the node at the target position.
When inserting at a specific position, you need to update the pointer ‘______’ to point to the node at the target position.
In the insertLast function, after checking if the list is empty, a pointer named ______ is initialized to traverse the list.
In the insertLast function, after checking if the list is empty, a pointer named ______ is initialized to traverse the list.
You must update the next pointer of ‘______’ to point to newnode during an insertion operation.
You must update the next pointer of ‘______’ to point to newnode during an insertion operation.
To insert a new node, you need to create a new ______.
To insert a new node, you need to create a new ______.
If the list is empty, then the head is assigned to the new ______.
If the list is empty, then the head is assigned to the new ______.
The variable ______ keeps track of the current position while inserting into the list.
The variable ______ keeps track of the current position while inserting into the list.
The ______ pointer of the previous node is updated to point to the next node of the target node.
The ______ pointer of the previous node is updated to point to the next node of the target node.
The new node's next pointer must point to the current node as part of the ______ process.
The new node's next pointer must point to the current node as part of the ______ process.
In deletion, we need to find the ______ and next nodes of the target node to delete it.
In deletion, we need to find the ______ and next nodes of the target node to delete it.
If curPos equals pos, the ______ breaks out of the loop during insertion.
If curPos equals pos, the ______ breaks out of the loop during insertion.
When inserting a node, if the list is not empty, we initiate by setting the current node to ______.
When inserting a node, if the list is not empty, we initiate by setting the current node to ______.
The function to search for a value in a linked list is called ______.
The function to search for a value in a linked list is called ______.
In a linked list, a new contact is created in a ______ when adding to a phonebook.
In a linked list, a new contact is created in a ______ when adding to a phonebook.
Web-browsers utilize linked lists to create a browsing ______.
Web-browsers utilize linked lists to create a browsing ______.
One of the advantages of linked lists is that insertion and deletion of nodes are ______.
One of the advantages of linked lists is that insertion and deletion of nodes are ______.
Linked lists are inherently ______ access structures.
Linked lists are inherently ______ access structures.
Singly linked lists are ______ to navigate backwards due to their structure.
Singly linked lists are ______ to navigate backwards due to their structure.
Nodes in a linked list can be stored in a ______ manner, increasing access time.
Nodes in a linked list can be stored in a ______ manner, increasing access time.
A significant disadvantage of linked lists is the requirement of extra ______ for pointers.
A significant disadvantage of linked lists is the requirement of extra ______ for pointers.
Insertion operation is used to insert a new node in the ______.
Insertion operation is used to insert a new node in the ______.
To insert a node at the first position, the next pointer of the new node should point towards the ______ node.
To insert a node at the first position, the next pointer of the new node should point towards the ______ node.
Inserting at last requires making the next pointer of the last node point to the ______ node.
Inserting at last requires making the next pointer of the last node point to the ______ node.
When inserting at first, if the head is null, the head pointer should be assigned to the ______.
When inserting at first, if the head is null, the head pointer should be assigned to the ______.
The two types of insertion include inserting at first and inserting at ______.
The two types of insertion include inserting at first and inserting at ______.
If head is null, it is considered as __________ and return.
If head is null, it is considered as __________ and return.
In the function deleteAtPos, if pos is equal to 1, the head is updated to __________.
In the function deleteAtPos, if pos is equal to 1, the head is updated to __________.
When searching in a linked list, we need a __________ which is assigned with the address of the head pointer.
When searching in a linked list, we need a __________ which is assigned with the address of the head pointer.
In the deleteAtPos function, if curPos equals pos, the loop will __________.
In the deleteAtPos function, if curPos equals pos, the loop will __________.
The statement 'prev->Next = curr->Next' is used to __________ the current node from the linked list.
The statement 'prev->Next = curr->Next' is used to __________ the current node from the linked list.
If the current pointer reaches null, it indicates we have traversed through the __________ of the linked list.
If the current pointer reaches null, it indicates we have traversed through the __________ of the linked list.
Before executing delete operations, we check if __________ is not NULL to ensure that the list has nodes.
Before executing delete operations, we check if __________ is not NULL to ensure that the list has nodes.
The loop continues until curPos is equal to pos or curr's __________ is null.
The loop continues until curPos is equal to pos or curr's __________ is null.
Flashcards
Queue
Queue
A list where elements are added at one end (rear) and removed from the other end (front).
Enqueue
Enqueue
Adding an element to the rear of a queue.
Dequeue
Dequeue
Removing an element from the front of a queue.
Peek
Peek
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Queue Operations
Queue Operations
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Array Implementation
Array Implementation
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Linked List Implementation
Linked List Implementation
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FIFO
FIFO
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Queue's Front
Queue's Front
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Queue's Rear
Queue's Rear
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Queue's Size
Queue's Size
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Queue Overflow
Queue Overflow
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Queue Underflow
Queue Underflow
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Queue Implementation
Queue Implementation
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Circular Array
Circular Array
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Queue is Full
Queue is Full
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How to check if the Queue is Full?
How to check if the Queue is Full?
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Empty Queue?
Empty Queue?
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Circular Queue Advantage
Circular Queue Advantage
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Limitations of Array Queue
Limitations of Array Queue
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Queue with Linked List
Queue with Linked List
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Front Pointer
Front Pointer
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Rear Pointer
Rear Pointer
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Queue Array Size
Queue Array Size
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Front and Rear
Front and Rear
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Queue is Empty
Queue is Empty
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Peek Operation
Peek Operation
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Array Overflow
Array Overflow
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Array Underflow
Array Underflow
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Implementation Advantages
Implementation Advantages
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Enqueuing in Linked List Queue
Enqueuing in Linked List Queue
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Dequeuing in Linked List Queue
Dequeuing in Linked List Queue
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Peek in Linked List Queue
Peek in Linked List Queue
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Linked List Queue Implementation Advantage
Linked List Queue Implementation Advantage
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Circular Array Queue vs. Linked List Queue
Circular Array Queue vs. Linked List Queue
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Wasteful Space in Circular Array Queue
Wasteful Space in Circular Array Queue
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More Memory Per Element in Linked List
More Memory Per Element in Linked List
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Empty Check in Linked List Queue
Empty Check in Linked List Queue
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Full Check in Linked List Queue
Full Check in Linked List Queue
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Circular Array Queue
Circular Array Queue
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How to check if the Queue is Empty?
How to check if the Queue is Empty?
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Pros of Array Queue
Pros of Array Queue
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Cons of Array Queue
Cons of Array Queue
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Why use a Circular Array?
Why use a Circular Array?
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Insertion in Linked List
Insertion in Linked List
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Inserting at First (Prepend)
Inserting at First (Prepend)
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Inserting at Last (Append)
Inserting at Last (Append)
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Head Pointer & Next Pointer
Head Pointer & Next Pointer
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Inserting in the Middle
Inserting in the Middle
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Inserting at Last
Inserting at Last
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Insertion at Position
Insertion at Position
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NULL Pointer
NULL Pointer
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LinkedList Deletion
LinkedList Deletion
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Deletion at the beginning of a list
Deletion at the beginning of a list
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Deletion in the middle of a list
Deletion in the middle of a list
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Deleting the last node
Deleting the last node
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How to search in a linked list
How to search in a linked list
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Linked List Search
Linked List Search
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What's the purpose of the 'prev' pointer?
What's the purpose of the 'prev' pointer?
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Importance of the 'next' pointer
Importance of the 'next' pointer
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Insertion at Position (Linked List)
Insertion at Position (Linked List)
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Steps for Insertion at Position
Steps for Insertion at Position
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Deletion in Linked List
Deletion in Linked List
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How to Delete a Node
How to Delete a Node
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Circular Linked List
Circular Linked List
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Linked List: What is it?
Linked List: What is it?
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Linked List: Advantages
Linked List: Advantages
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Linked List: Disadvantages
Linked List: Disadvantages
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Singly Linked List
Singly Linked List
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Doubly Linked List
Doubly Linked List
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Linked List: Web-browser
Linked List: Web-browser
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Linked List: Phonebook
Linked List: Phonebook
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Linked List: Image Viewer
Linked List: Image Viewer
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Study Notes
Queues
- A queue is a list where insertions happen at one end (rear) and deletions at the other (front)
- First-In, First-Out (FIFO) principle; the first element added is the first element removed
- Elements are added to the rear of the queue, and only the front element can be accessed or removed
- Basic queue operations include
add
(enqueue), which adds an item to the back;remove
(dequeue), which removes the item from the front; andpeek
, which examines the front item without removing it - Real-world examples include print queues, network packet queues, and lines of customers or clients
Queue Implementation
- Array-based Implementation:
- An array is used to store the queue elements
- Variables,
front
andrear
, keep track of the front and rear of the queue positions in the array size
variable tracks the number of elements in the queue- Operations such as
enqueue
,dequeue
, andpeek
adjust thefront
,rear
, andsize
accordingly
- Circular Array Implementation:
- A circular array maintains an array to store queue elements
- It implements the concept of wraparound which is the key to optimizing queue operations efficiently
- When
rear
reaches the end of the array, it wraps around to the beginning - Operations stay very efficient
- When
- Linked List Implementation:
- A linked list is used with pointers for
front
andrear
nodes of queue - The nodes are dynamically allocated to store data, allowing for flexible queue length
enqueue
anddequeue
operations adjust the front and rear pointers accordingly
- A linked list is used with pointers for
Queue Operations
enqueue(value)
- Adds a value to the rear of the queue
dequeue()
- Removes and returns the value at the front of the queue
peek()
- Returns the value at the front of the queue without removing it
isFull()
- Returns true if the queue is full; returns false otherwise
isEmpty()
- Returns true if the queue is empty; returns false otherwise
Circular Array vs. Linked List
- Circular Array
- Efficient operations
- Potential for wasted space if the queue is not full
- Linked List
- Always has enough space; no wasted space
- More overhead due to pointers, which might slightly affect the speed of the operations
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