Class 12 Stacks Queues and Linked List Revision Notes

Computer Science
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Study Material for Class 12 Computer Science Stacks Queues and Linked List

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Class 12 Computer Science Stacks Queues and Linked List

Stack

In computer science, a stack is a Last in, First out (LIFO) data structure. It simply means that an element that is inserted at the end will be deleted first. To Manage a stack all the insertion and deletion takes place from one position called “top”.
One of the common uses of stack is in function call.
 
♦ Operations on the Stack

There are two fundamental operations
Push
Pop
Push means to insert an element
Pop means to delete an element
 
Queue

In computer science, a Queue is a First in, First out (FIFO) data structure. It simply means that an element that is inserted at the beginning will be deleted first. To Manage a queue all the insertion and deletion takes place from two different positions called “front” and “rear”.
Every element is inserted from the rear position and deleted from the front position in the queue.
 
Linked List

A linked list is a data structure consisting of a group of nodes which together represent a sequence. Under the simplest form, each node is composed of a data and a reference (in other words, a link) to the next node in the sequence; more complex variants add additional links. This structure allows for efficient insertion or removal of elements from any position in the sequence.
 
Here in the figure is an example of a linked list whose nodes contain two fields: an integer value and a link to the next node. The last node is linked to a terminator used to signify the end of the list. Linked lists are among the simplest and most common data structures. They can be used to implement several other common abstract data types, stacks, queues etc though it is not uncommon to implement the other data structures directly without using a list as the basis of implementation.
The principal benefit of a linked list over an array is that the list elements can easily be inserted or removed without reallocation or reorganization of the entire structure because the data items need not be stored contiguously in memory or on disk. Linked lists allow insertion and removal of nodes at any point in the list, and can do so with a constant number of operations if the link previous to the link being added or removed is maintained during list traversal.
Linked list are dynamic structure where memory allocation takes place at run time.
 
♦ Operation on a linked list

There are three basic operations on a linked list
Insertion
Deletion
Traversal
 
Inserting a node or element into Linked list :
Inserting an element into linked list contains 3 types .
1. Insertion at beginning of the Linked list
2. Insertion after/before any element of the linked list
3. Insertion at the end of the linked list
 
♦ Deleting a node from the Linked list

A node can be deleted in 3 ways similar to Insertion.
1. Deleting a Node from the beginning of the Linked List
2. Deleting a node before/after an element from the Linked list.
3. Deleting a node from the end of the Linked List .
 
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