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Introduction to Linked List
Introduction to Linked List


Linked List | Set 1 (Introduction) – GeeksforGeeks

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Linked List | Set 1 (Introduction) - GeeksforGeeks
Linked List | Set 1 (Introduction) – GeeksforGeeks

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Linked List Program in C

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Implementation in C

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Linked List Program in C
Linked List Program in C

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Linked List Data Structure

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  • Summary of article content: Articles about Linked List Data Structure Lists are one of the most popular and efficient data structures, with implementation in every programming language like C, … …
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Representation of Linked List

Linked List Utility

Linked List Implementations in Python Java C and C++ Examples

Linked List Complexity

Linked List Applications

Linked List Data Structure
Linked List Data Structure

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Linked lists – Learn C – Free Interactive C Tutorial

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Linked lists - Learn C - Free Interactive C Tutorial
Linked lists – Learn C – Free Interactive C Tutorial

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Danh sách liên kết đơn | Cài đặt danh sách liên kết đơn trong C/C++

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  • Most searched keywords: Whether you are looking for Danh sách liên kết đơn | Cài đặt danh sách liên kết đơn trong C/C++ Nếu head = NULL, tức là danh sách liên kết đang trống. Khi đó Node mới(temp) sẽ là head luôn. Ngược lại, ta sẽ duyệt tới Node cuối cùng(Node có next = NULL) … Danh sách liên kết đơn(Single linked list) là danh sách liên kết chỉ có sự kết nối từ phần tử phía trước tới phần tử phía sau.
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1 Lý thuyết về danh sách liên kết

2 Danh sách liên kết là gì

3 Cài đặt danh sách liên kết đơn

4 Code hoàn chỉnh của danh sách liên kết đơn

Danh sách liên kết đơn | Cài đặt danh sách liên kết đơn trong C/C++
Danh sách liên kết đơn | Cài đặt danh sách liên kết đơn trong C/C++

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Linked List in C | Implement LinkedList Data Structure | Edureka

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What is Linked List in C

Basic Linked List Functions

Doubly Linked List

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Linked List in C | Implement LinkedList Data Structure | Edureka
Linked List in C | Implement LinkedList Data Structure | Edureka

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[CTDL] – Danh sách liên kết đơn – Linked List – Phần 1. Giới thiệu » Cafedev.vn

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1 Tại sao lại là Linked List

2 Ưu điểm của Linked List so với Array

3 Hạn chế của Linked List

4 Mô tả

5 Duyệt Linked List

[CTDL] - Danh sách liên kết đơn - Linked List - Phần 1. Giới thiệu » Cafedev.vn
[CTDL] – Danh sách liên kết đơn – Linked List – Phần 1. Giới thiệu » Cafedev.vn

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Linked List in C

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  • Table of Contents:

Data

Reference to the next node

Selecting a data type for the linked list

Sample Linked List Node

Let’s create and allocate memory for 3 nodes

Assign values to each node

Linking each nodes

Let’s print each node data in a linked list

Sample Linked List Implementation

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Linked List in C
Linked List in C

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Linked List

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Ưu điểm

Nhược điểm

Linked List
Linked List

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Set 1 (Introduction) – GeeksforGeeks

Like arrays, Linked List is a linear data structure. Unlike arrays, linked list elements are not stored at a contiguous location; the elements are linked using pointers. They includes a series of connected nodes. Here, each node stores the data and the address of the next node.

Why Linked List?

Arrays can be used to store linear data of similar types, but arrays have the following limitations.

The size of the arrays is fixed : So we must know the upper limit on the number of elements in advance. Also, generally, the allocated memory is equal to the upper limit irrespective of the usage.

: So we must know the upper limit on the number of elements in advance. Also, generally, the allocated memory is equal to the upper limit irrespective of the usage. Insertion of a new element / Deletion of a existing element in an array of elements is expensive: The room has to be created for the new elements and to create room existing elements have to be shifted but in Linked list if we have the head node then we can traverse to any node through it and insert new node at the required position.

For example, in a system, if we maintain a sorted list of IDs in an array id[].

id[] = [1000, 1010, 1050, 2000, 2040].

And if we want to insert a new ID 1005, then to maintain the sorted order, we have to move all the elements after 1000 (excluding 1000).

Deletion is also expensive with arrays until unless some special techniques are used. For example, to delete 1010 in id[], everything after 1010 has to be moved due to this so much work is being done which affects the efficiency of the code.

Advantages over arrays:

Dynamic Array. Ease of Insertion/Deletion.

Drawbacks:

Random access is not allowed. We have to access elements sequentially starting from the first node(head node). So we cannot do binary search with linked lists efficiently with its default implementation. Read about it here. Extra memory space for a pointer is required with each element of the list. Not cache friendly. Since array elements are contiguous locations, there is locality of reference which is not there in case of linked lists.

Representation:

A linked list is represented by a pointer to the first node of the linked list. The first node is called the head. If the linked list is empty, then the value of the head points to NULL.

Each node in a list consists of at least two parts:

A Data Item (we can store integer, strings or any type of data). Pointer (Or Reference) to the next node (connects one node to another) or An address of another node

In C, we can represent a node using structures. Below is an example of a linked list node with integer data.

In Java or C#, LinkedList can be represented as a class and a Node as a separate class. The LinkedList class contains a reference of Node class type.

C

struct Node { int data; struct Node* next; }; C++

class Node { public : int data; Node* next; }; Java

class LinkedList { Node head; class Node { int data; Node next; Node( int d) { data = d; next = null ; } } } Python

class Node: def __init__( self , data): self .data = data self . next = None class LinkedList: def __init__( self ): self .head = None C#

class LinkedList { Node head; class Node { int data; Node next; Node( int d) { data = d; } } } Javascript

First Simple Linked List in C:

Let us create a simple linked list with 3 nodes.

C++

#include using namespace std; class Node { public : int data; Node* next; }; int main() { Node* head = NULL; Node* second = NULL; Node* third = NULL; head = new Node(); second = new Node(); third = new Node(); head->data = 1; head->next = second; second->data = 2; second->next = third; third->data = 3; third->next = NULL; return 0; } C

#include #include struct Node { int data; struct Node* next; }; int main() { struct Node* head = NULL; struct Node* second = NULL; struct Node* third = NULL; head = ( struct Node*) malloc ( sizeof ( struct Node)); second = ( struct Node*) malloc ( sizeof ( struct Node)); third = ( struct Node*) malloc ( sizeof ( struct Node)); head->data = 1; head->next = second; second->data = 2; second->next = third; third->data = 3; third->next = NULL; return 0; } Java

class LinkedList { Node head; static class Node { int data; Node next; Node( int d) { data = d; next = null ; } } public static void main(String[] args) { LinkedList llist = new LinkedList(); llist.head = new Node( 1 ); Node second = new Node( 2 ); Node third = new Node( 3 ); llist.head.next = second; second.next = third; } } Python

class Node: def __init__( self , data): self .data = data self . next = None class LinkedList: def __init__( self ): self .head = None if __name__ = = ‘__main__’ : llist = LinkedList() llist.head = Node( 1 ) second = Node( 2 ) third = Node( 3 ) llist.head. next = second; second. next = third; C#

using System; public class LinkedList { Node head; public class Node { public int data; public Node next; public Node( int d) { data = d; next = null ; } } public static void Main(String[] args) { LinkedList llist = new LinkedList(); llist.head = new Node(1); Node second = new Node(2); Node third = new Node(3); llist.head.next = second; second.next = third; } } Javascript

Linked List Traversal

In the previous program, we have created a simple linked list with three nodes. Let us traverse the created list and print the data of each node. For traversal, let us write a general-purpose function printList() that prints any given list.

C++

#include using namespace std; class Node { public : int data; Node* next; }; void printList(Node* n) { while (n != NULL) { cout << n->data << " " ; n = n->next; } } int main() { Node* head = NULL; Node* second = NULL; Node* third = NULL; head = new Node(); second = new Node(); third = new Node(); head->data = 1; head->next = second; second->data = 2; second->next = third; third->data = 3; third->next = NULL; printList(head); return 0; } C

#include #include struct Node { int data; struct Node* next; }; void printList( struct Node* n) { while (n != NULL) { printf ( ” %d ” , n->data); n = n->next; } } int main() { struct Node* head = NULL; struct Node* second = NULL; struct Node* third = NULL; head = ( struct Node*) malloc ( sizeof ( struct Node)); second = ( struct Node*) malloc ( sizeof ( struct Node)); third = ( struct Node*) malloc ( sizeof ( struct Node)); head->data = 1; head->next = second; second->data = 2; second->next = third; third->data = 3; third->next = NULL; printList(head); return 0; } Java

class LinkedList { Node head; static class Node { int data; Node next; Node( int d) { this .data = d; next = null ; } } public void printList() { Node n = head; while (n != null ) { System.out.print(n.data + ” ” ); n = n.next; } } public static void main(String[] args) { LinkedList llist = new LinkedList(); llist.head = new Node( 1 ); Node second = new Node( 2 ); Node third = new Node( 3 ); llist.head.next = second; second.next = third; llist.printList(); } } Python3

class Node: def __init__( self , data): self .data = data self . next = None class LinkedList: def __init__( self ): self .head = None def printList( self ): temp = self .head while (temp): print (temp.data) temp = temp. next if __name__ = = ‘__main__’ : llist = LinkedList() llist.head = Node( 1 ) second = Node( 2 ) third = Node( 3 ) llist.head. next = second; second. next = third; llist.printList() C#

using System; public class LinkedList { Node head; public class Node { public int data; public Node next; public Node( int d) { data = d; next = null ; } } public void printList() { Node n = head; while (n != null ) { Console.Write(n.data + ” ” ); n = n.next; } } public static void Main(String[] args) { LinkedList llist = new LinkedList(); llist.head = new Node(1); Node second = new Node(2); Node third = new Node(3); llist.head.next = second; second.next = third; llist.printList(); } } Javascript

Output:

1 2 3

Linked List Complexity:

Time Complexity

Time Complexity Worst Case Average Case Search O(n) O(n) Insert O(1) O(1) Deletion O(1) O(1)

Auxiliary Space: O(n)

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Linked List Program in C

Linked List Program in C

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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.

Implementation in C

#include #include #include #include struct node { int data; int key; struct node *next; }; struct node *head = NULL; struct node *current = NULL; //display the list void printList() { struct node *ptr = head; printf(”

[ “); //start from the beginning while(ptr != NULL) { printf(“(%d,%d) “,ptr->key,ptr->data); ptr = ptr->next; } printf(” ]”); } //insert link at the first location void insertFirst(int key, int data) { //create a link struct node *link = (struct node*) malloc(sizeof(struct node)); link->key = key; link->data = data; //point it to old first node link->next = head; //point first to new first node head = link; } //delete first item struct node* deleteFirst() { //save reference to first link struct node *tempLink = head; //mark next to first link as first head = head->next; //return the deleted link return tempLink; } //is list empty bool isEmpty() { return head == NULL; } int length() { int length = 0; struct node *current; for(current = head; current != NULL; current = current->next) { length++; } return length; } //find a link with given key struct node* find(int key) { //start from the first link struct node* current = head; //if list is empty if(head == NULL) { return NULL; } //navigate through list while(current->key != key) { //if it is last node if(current->next == NULL) { return NULL; } else { //go to next link current = current->next; } } //if data found, return the current Link return current; } //delete a link with given key struct node* delete(int key) { //start from the first link struct node* current = head; struct node* previous = NULL; //if list is empty if(head == NULL) { return NULL; } //navigate through list while(current->key != key) { //if it is last node if(current->next == NULL) { return NULL; } else { //store reference to current link previous = current; //move to next link current = current->next; } } //found a match, update the link if(current == head) { //change first to point to next link head = head->next; } else { //bypass the current link previous->next = current->next; } return current; } void sort() { int i, j, k, tempKey, tempData; struct node *current; struct node *next; int size = length(); k = size ; for ( i = 0 ; i < size - 1 ; i++, k-- ) { current = head; next = head->next; for ( j = 1 ; j < k ; j++ ) { if ( current->data > next->data ) { tempData = current->data; current->data = next->data; next->data = tempData; tempKey = current->key; current->key = next->key; next->key = tempKey; } current = current->next; next = next->next; } } } void reverse(struct node** head_ref) { struct node* prev = NULL; struct node* current = *head_ref; struct node* next; while (current != NULL) { next = current->next; current->next = prev; prev = current; current = next; } *head_ref = prev; } void main() { insertFirst(1,10); insertFirst(2,20); insertFirst(3,30); insertFirst(4,1); insertFirst(5,40); insertFirst(6,56); printf(“Original List: “); //print list printList(); while(!isEmpty()) { struct node *temp = deleteFirst(); printf(”

Deleted value:”); printf(“(%d,%d) “,temp->key,temp->data); } printf(”

List after deleting all items: “); printList(); insertFirst(1,10); insertFirst(2,20); insertFirst(3,30); insertFirst(4,1); insertFirst(5,40); insertFirst(6,56); printf(”

Restored List: “); printList(); printf(”

“); struct node *foundLink = find(4); if(foundLink != NULL) { printf(“Element found: “); printf(“(%d,%d) “,foundLink->key,foundLink->data); printf(”

“); } else { printf(“Element not found.”); } delete(4); printf(“List after deleting an item: “); printList(); printf(”

“); foundLink = find(4); if(foundLink != NULL) { printf(“Element found: “); printf(“(%d,%d) “,foundLink->key,foundLink->data); printf(”

“); } else { printf(“Element not found.”); } printf(”

“); sort(); printf(“List after sorting the data: “); printList(); reverse(&head); printf(”

List after reversing the data: “); printList(); }

If we compile and run the above program, it will produce the following result −

Output

Original List: [ (6,56) (5,40) (4,1) (3,30) (2,20) (1,10) ] Deleted value:(6,56) Deleted value:(5,40) Deleted value:(4,1) Deleted value:(3,30) Deleted value:(2,20) Deleted value:(1,10) List after deleting all items: [ ] Restored List: [ (6,56) (5,40) (4,1) (3,30) (2,20) (1,10) ] Element found: (4,1) List after deleting an item: [ (6,56) (5,40) (3,30) (2,20) (1,10) ] Element not found. List after sorting the data: [ (1,10) (2,20) (3,30) (5,40) (6,56) ] List after reversing the data: [ (6,56) (5,40) (3,30) (2,20) (1,10) ]

linked_list_algorithms.htm

Linked list Data Structure

A linked list is a linear data structure that includes a series of connected nodes. Here, each node stores the data and the address of the next node. For example,

Linked list Data Structure

You have to start somewhere, so we give the address of the first node a special name called HEAD . Also, the last node in the linked list can be identified because its next portion points to NULL .

Linked lists can be of multiple types: singly, doubly, and circular linked list. In this article, we will focus on the singly linked list. To learn about other types, visit Types of Linked List.

Note: You might have played the game Treasure Hunt, where each clue includes the information about the next clue. That is how the linked list operates.

Representation of Linked List

Let’s see how each node of the linked list is represented. Each node consists:

A data item

An address of another node

We wrap both the data item and the next node reference in a struct as:

struct node { int data; struct node *next; };

Understanding the structure of a linked list node is the key to having a grasp on it.

Each struct node has a data item and a pointer to another struct node. Let us create a simple Linked List with three items to understand how this works.

/* Initialize nodes */ struct node *head; struct node *one = NULL; struct node *two = NULL; struct node *three = NULL; /* Allocate memory */ one = malloc(sizeof(struct node)); two = malloc(sizeof(struct node)); three = malloc(sizeof(struct node)); /* Assign data values */ one->data = 1; two->data = 2; three->data=3; /* Connect nodes */ one->next = two; two->next = three; three->next = NULL; /* Save address of first node in head */ head = one;

If you didn’t understand any of the lines above, all you need is a refresher on pointers and structs.

In just a few steps, we have created a simple linked list with three nodes.

Linked list Representation

The power of a linked list comes from the ability to break the chain and rejoin it. E.g. if you wanted to put an element 4 between 1 and 2, the steps would be:

Create a new struct node and allocate memory to it.

Add its data value as 4

Point its next pointer to the struct node containing 2 as the data value

Change the next pointer of “1” to the node we just created.

Doing something similar in an array would have required shifting the positions of all the subsequent elements.

In python and Java, the linked list can be implemented using classes as shown in the codes below.

Linked List Utility

Lists are one of the most popular and efficient data structures, with implementation in every programming language like C, C++, Python, Java, and C#.

Apart from that, linked lists are a great way to learn how pointers work. By practicing how to manipulate linked lists, you can prepare yourself to learn more advanced data structures like graphs and trees.

Linked List Implementations in Python, Java, C, and C++ Examples

# Linked list implementation in Python class Node: # Creating a node def __init__(self, item): self.item = item self.next = None class LinkedList: def __init__(self): self.head = None if __name__ == ‘__main__’: linked_list = LinkedList() # Assign item values linked_list.head = Node(1) second = Node(2) third = Node(3) # Connect nodes linked_list.head.next = second second.next = third # Print the linked list item while linked_list.head != None: print(linked_list.head.item, end=” “) linked_list.head = linked_list.head.next // Linked list implementation in Java class LinkedList { // Creating a node Node head; static class Node { int value; Node next; Node(int d) { value = d; next = null; } } public static void main(String[] args) { LinkedList linkedList = new LinkedList(); // Assign value values linkedList.head = new Node(1); Node second = new Node(2); Node third = new Node(3); // Connect nodess linkedList.head.next = second; second.next = third; // printing node-value while (linkedList.head != null) { System.out.print(linkedList.head.value + ” “); linkedList.head = linkedList.head.next; } } } // Linked list implementation in C #include #include // Creating a node struct node { int value; struct node *next; }; // print the linked list value void printLinkedlist(struct node *p) { while (p != NULL) { printf(“%d “, p->value); p = p->next; } } int main() { // Initialize nodes struct node *head; struct node *one = NULL; struct node *two = NULL; struct node *three = NULL; // Allocate memory one = malloc(sizeof(struct node)); two = malloc(sizeof(struct node)); three = malloc(sizeof(struct node)); // Assign value values one->value = 1; two->value = 2; three->value = 3; // Connect nodes one->next = two; two->next = three; three->next = NULL; // printing node-value head = one; printLinkedlist(head); } // Linked list implementation in C++ #include #include using namespace std; // Creating a node class Node { public: int value; Node* next; }; int main() { Node* head; Node* one = NULL; Node* two = NULL; Node* three = NULL; // allocate 3 nodes in the heap one = new Node(); two = new Node(); three = new Node(); // Assign value values one->value = 1; two->value = 2; three->value = 3; // Connect nodes one->next = two; two->next = three; three->next = NULL; // print the linked list value head = one; while (head != NULL) { cout << head->value; head = head->next; } }

Linked List Complexity

Time Complexity

Worst case Average Case Search O(n) O(n) Insert O(1) O(1) Deletion O(1) O(1)

Space Complexity: O(n)

Linked List Applications

Dynamic memory allocation

Implemented in stack and queue

In undo functionality of softwares

functionality of softwares Hash tables, Graphs

Recommended Readings

1. Tutorials

2. Examples

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