two ways

arrays

A Linear data structure have data elements arranged in sequential manner and each member element is connected to its previous and next element. Such data structures are easy to implement as computer memory is also sequential. Examples of linear data structures are List, Queue, Stack, Array etc.

Implementation of graphs : Adjacency list representation of graphs is most popular which is uses linked list to store adjacent vertices. Dynamic memory allocation : We use linked list of free blocks.

Linked lists are useful because they support the efficient insertion and removal of elements at the expense of inefficient element access, as opposed to arrays. When a variable is created, the computer must allocate memory.

Circular Linked List is a variation of Linked list in which the first element points to the last element and the last element points to the first element. Both Singly Linked List and Doubly Linked List can be made into a circular linked list.

Doubly Linked List

• A music player which has next and previous buttons.
• Undo Redo operations.
• The Browser cache which allows you to move front and back between pages is also a good example of doubly linked list.
• LRU cache.
• Most Recently Used is also an example of DLL.
• A deck of cards in a game is a classic example of application of DLL.

Properties of Linked List

• The first node of the linked list is called the head of the linked list.
• The last node of the linked list is pointing to NULL(None) which indicates that it is the last node.
• Unlike arrays, linked list elements are not stored at contiguous memory locations.

Doubly Linked List has the flexibility of traversing the list in both the ways i.e., forwad and backward unlike singly linked list where movement is restricted in forward direction only. Doubly Linked List contains an extra pointer to link the previous node which enables the backward traversing.

Following are the various types of linked list. Simple Linked List − Item navigation is forward only. Doubly Linked List − Items can be navigated forward and backward. Circular Linked List − Last item contains link of the first element as next and the first element has a link to the last element as previous.

A linked list is a linear data structure, in which the elements are not stored at contiguous memory locations. The elements in a linked list are linked using pointers. In simple words, a linked list consists of nodes where each node contains a data field and a reference(link) to the next node in the list.

Linked list is a linear data structure. It is a collection of data elements, called nodes pointing to the next node by means of a pointer. Linked list is used to create trees and graphs. In linked list, each node consists of its own data and the address of the next node and forms a chain.

To iterate over all the members of the linked list, we use a pointer called current . We set it to start from the head and then in each step, we advance the pointer to the next item in the list, until we reach the last item.

Insertion in singly linked list at beginning

1. ptr = (struct node *) malloc(sizeof(struct node *));
2. ptr → data = item.

Insertion at the beginning of the Linked List. Let us assume a newNode as shown above. The newNode with data=5 has to be inserted at the beginning of the linked list. For this to happen, the address part of the newNode should point to the address of the head node.

The task is to insert the given elements at the middle position in the linked list one after another. Each insert operation should take O(1) time complexity.

(1) Linked lists can be represented in memory by using two arrays respectively known as INFO and LINK, such that INFO[K] and LINK[K] contains information of element and next node address respectively. It indicates that the node of a list need not occupy adjacent elements in the array INFO and LINK.

A linked list is a common data structure made of a chain of nodes in which each node contains a value and a pointer to the next node in the chain. The head pointer points to the first node, and the last element of the list points to null. When the list is empty, the head pointer points to null.

You can search an element inside LinkedList in Java by using indexOf() and lastIndexOf() methods. Though LinkedList doesn’t support random search like ArrayList, you can still go through the list, check each element and find out whether its interested element or not.

Singly linked list is a type of data structure that is made up of nodes that are created using self referential structures. Each of these nodes contain two parts, namely the data and the reference to the next list node. Only the reference to the first list node is required to access the whole linked list.

A linked list is a sequence of data structures, which are connected together via links. Linked List is a sequence of links which contains items. Each link contains a connection to another link. Linked list is the second most-used data structure after array.

Algorithm

1. Create a class Node which has two attributes: data and next. Next is a pointer to the next node.
2. Create another class which has two attributes: head and tail.
3. addNode() will add a new node to the list: Create a new node.
4. display() will display the nodes present in the list:

The linked list requires more memory to store the elements than an array, because each node of the linked list points a pointer, due to which it requires more memory. It is very difficult to traverse the nodes in a linked list.

Arrays represent multiple data items of the same type using a single name. In arrays, the elements can be accessed randomly by using the index number. Arrays allocate memory in contiguous memory locations for all its elements. Hence there is no chance of extra memory being allocated in case of arrays.