{"id":3610,"date":"2026-07-01T19:13:16","date_gmt":"2026-07-01T13:43:16","guid":{"rendered":"https:\/\/wordpress-prod.sharpener.tech\/?p=3610"},"modified":"2026-07-03T19:13:42","modified_gmt":"2026-07-03T13:43:42","slug":"linked-list-in-data-structures","status":"publish","type":"post","link":"https:\/\/www.sharpener.tech\/blog\/linked-list-in-data-structures\/","title":{"rendered":"Linked List in Data Structures: Complete Beginner&#8217;s Guide with Examples"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">If you are starting your journey in Data Structures and Algorithms (DSA), one of the first concepts you will learn after arrays is the <strong>Linked List<\/strong>. It is one of the most important data structures because it solves many problems that arrays cannot handle efficiently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you are preparing for coding interviews, learning programming, or building software applications, understanding linked lists is essential. Many popular companies ask linked list questions during technical interviews because they test your understanding of pointers, memory management, and problem-solving skills.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike arrays, linked lists do not store data in continuous memory locations. Instead, each element is connected to the next element using a reference or pointer. This unique structure makes linked lists highly flexible for inserting and deleting data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By the end of this article, you&#8217;ll have a clear understanding of linked lists and know when to use them in real-world applications.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">What is a Linked List?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Linked List<\/strong> is a linear data structure where each element is stored inside a separate object called a <strong>node<\/strong>. Every node contains two parts:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data<\/li>\n\n\n\n<li>Address (Pointer) to the next node<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike arrays, linked lists do not require consecutive memory locations. Each node can be stored anywhere in memory while remaining connected through pointers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Simple Definition<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A linked list is a collection of connected nodes where each node stores data and the address of the next node.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Think of it like a treasure hunt. Every clue tells you where to find the next clue until you reach the final destination.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Structure of a Node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Each node consists of:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>---------------------\n| Data | Next Node |\n---------------------\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Here,<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>10 is the first node.<\/li>\n\n\n\n<li>20 is the second node.<\/li>\n\n\n\n<li>30 is the third node.<\/li>\n\n\n\n<li>40 is the last node.<\/li>\n\n\n\n<li>NULL indicates the end of the linked list.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding Through an Example<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Imagine a train.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Engine \u2192 Coach1 \u2192 Coach2 \u2192 Coach3\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Every coach knows which coach comes next.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If a new coach needs to be added between Coach1 and Coach2, it can simply be connected without moving the other coaches.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Arrays cannot do this efficiently because every element after the insertion point must be shifted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This flexibility makes linked lists extremely useful.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Do We Need a Linked List?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before linked lists were introduced, programmers mainly used arrays.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although arrays are fast, they come with several limitations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Problems with Arrays<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Fixed Size<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Once an array is created, its size is fixed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int marks&#91;100];\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Even if only 20 elements are used, the remaining 80 memory locations stay unused.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On the other hand, if more than 100 elements are needed, the array becomes full.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Expensive Insertions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose we have:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 20 30 40 50\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Insert 25 after 20.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Array becomes:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 20 25 30 40 50\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The elements 30, 40, and 50 must be shifted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For large datasets, this operation becomes slow.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Expensive Deletions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Delete 30:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 20 30 40 50\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">After:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 20 40 50\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Again, elements need to be shifted.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. Memory Waste<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Large arrays often allocate memory that remains unused.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reduces memory efficiency.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How Linked Lists Solve These Problems<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists allow:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Dynamic memory allocation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Easy insertion<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Easy deletion<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Efficient memory usage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2714 Flexible data storage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Since nodes are connected using pointers, new nodes can be inserted without shifting existing elements.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Real-Life Example of a Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Learning becomes easier when we compare programming concepts with everyday situations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Example 1: Music Playlist<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Imagine your favorite music playlist.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Song A\n\u2193\n\nSong B\n\u2193\n\nSong C\n\u2193\n\nSong D\n\u2193\n\nEnd Playlist\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Every song knows which song comes next.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you add a new song between Song B and Song C:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Song A\n\n\u2193\n\nSong B\n\n\u2193\n\nNew Song\n\n\u2193\n\nSong C\n\n\u2193\n\nSong D\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">No songs need to be moved.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Only the connections change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is exactly how linked lists work.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Example 2: Train Coaches<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>Engine\n\n\u2193\n\nCoach 1\n\n\u2193\n\nCoach 2\n\n\u2193\n\nCoach 3\n\n\u2193\n\nCoach 4\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Adding a coach between Coach2 and Coach3 only changes the connections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No coach needs to be shifted.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Example 3: Navigation System<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While using Google Maps:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Current Location\n\n\u2193\n\nTurn Left\n\n\u2193\n\nGo Straight\n\n\u2193\n\nTurn Right\n\n\u2193\n\nDestination\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each instruction points to the next one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This sequence resembles a linked list.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Components of a Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A linked list is made up of several important components.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A node is the basic building block.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Each node stores:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data<\/li>\n\n\n\n<li>Pointer<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>--------------------\n| 25 | Address |\n--------------------\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Head<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The first node is called the <strong>Head<\/strong>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Head\n\n\u2193\n\n10 \u2192 20 \u2192 30 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Without the head pointer, the linked list cannot be accessed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Tail<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The last node is called the Tail.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40 \u2192 NULL\n                   \u2191\n                 Tail\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Its pointer always points to NULL.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Pointer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A pointer stores the memory address of the next node.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 | -----&gt; 20\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Pointers connect all nodes together.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">How Does a Linked List Work?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s build one step by step.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Initially:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Head\n\n\u2193\n\nNULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Create first node:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Head\n\n\u2193\n\n15 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Insert second node:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Head\n\n\u2193\n\n15 \u2192 30 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Insert third node:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Head\n\n\u2193\n\n15 \u2192 30 \u2192 45 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each new node is connected using its pointer.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Memory Representation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike arrays:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Array\n\n100\n101\n102\n103\n104\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Linked Lists may look like:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Address      Data      Next\n\n900          10        450\n\n450          20        1200\n\n1200         30        NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Notice that nodes are stored in different memory locations but remain connected through pointers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Key Features of Linked Lists<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dynamic size<\/li>\n\n\n\n<li>Non-contiguous memory allocation<\/li>\n\n\n\n<li>Efficient insertions<\/li>\n\n\n\n<li>Efficient deletions<\/li>\n\n\n\n<li>Sequential access<\/li>\n\n\n\n<li>Better memory utilization<\/li>\n\n\n\n<li>Flexible data organization<\/li>\n\n\n\n<li>Widely used in advanced data structures like stacks, queues, graphs, and hash tables<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Quick Recap<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A linked list:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stores data in nodes.<\/li>\n\n\n\n<li>Uses pointers to connect nodes.<\/li>\n\n\n\n<li>Does not require continuous memory.<\/li>\n\n\n\n<li>Supports dynamic memory allocation.<\/li>\n\n\n\n<li>Makes insertion and deletion easier than arrays.<\/li>\n\n\n\n<li>Is commonly used in software development, operating systems, and interview problems.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Types of Linked Lists<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists come in different types, each designed to solve specific problems. The main difference between them is how the nodes are connected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding these types is important because many coding interview questions are based on selecting the right linked list for a given scenario.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">1. Singly Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Singly Linked List<\/strong> is the simplest type of linked list. Each node contains:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data<\/li>\n\n\n\n<li>A pointer to the next node<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It can only be traversed in one direction\u2014from the first node to the last.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Head\n \u2193\n10 \u2192 20 \u2192 30 \u2192 40 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">How It Works<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The first node is called the <strong>Head<\/strong>.<\/li>\n\n\n\n<li>Each node points to the next node.<\/li>\n\n\n\n<li>The last node points to <strong>NULL<\/strong>, indicating the end of the list.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Easy to implement<\/li>\n\n\n\n<li>Uses less memory<\/li>\n\n\n\n<li>Faster insertion at the beginning<\/li>\n\n\n\n<li>Suitable for simple applications<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Disadvantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cannot move backward<\/li>\n\n\n\n<li>Deleting the previous node requires traversal<\/li>\n\n\n\n<li>Reverse traversal is not possible<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Music playlists<\/li>\n\n\n\n<li>Task scheduling<\/li>\n\n\n\n<li>Browser history (basic implementation)<\/li>\n\n\n\n<li>Dynamic memory allocation<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">2. Doubly Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">In a <strong>Doubly Linked List<\/strong>, each node stores two pointers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Previous node<\/li>\n\n\n\n<li>Next node<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This allows traversal in both forward and backward directions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>NULL \u2190 10 \u21c4 20 \u21c4 30 \u21c4 40 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each node contains:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-----------------------------\n| Previous | Data | Next |\n-----------------------------\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Forward traversal<\/li>\n\n\n\n<li>Backward traversal<\/li>\n\n\n\n<li>Easier deletion<\/li>\n\n\n\n<li>Easier insertion before any node<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Disadvantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Requires extra memory<\/li>\n\n\n\n<li>More complex implementation<\/li>\n\n\n\n<li>Additional pointer updates<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Real-World Example<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A browser&#8217;s <strong>Back<\/strong> and <strong>Forward<\/strong> buttons work similarly to a doubly linked list.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">3. Circular Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">In a <strong>Circular Linked List<\/strong>, the last node does not point to <strong>NULL<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Instead, it points back to the first node.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n\u2191              \u2193\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The list forms a continuous loop.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No NULL pointer<\/li>\n\n\n\n<li>Traversal can start from any node<\/li>\n\n\n\n<li>Efficient for repetitive tasks<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CPU scheduling<\/li>\n\n\n\n<li>Multiplayer games<\/li>\n\n\n\n<li>Music playlists on repeat mode<\/li>\n\n\n\n<li>Round-robin scheduling<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">4. Circular Doubly Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">This is a combination of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Doubly Linked List<\/li>\n\n\n\n<li>Circular Linked List<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each node has:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Previous pointer<\/li>\n\n\n\n<li>Next pointer<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The last node connects back to the first node.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>      \u2190\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2192\n10 \u21c4 20 \u21c4 30 \u21c4 40\n\u2191                 \u2193\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Traverse in both directions<\/li>\n\n\n\n<li>Circular navigation<\/li>\n\n\n\n<li>Faster insertion and deletion<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Image galleries<\/li>\n\n\n\n<li>Undo and redo functionality<\/li>\n\n\n\n<li>Navigation systems<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Comparison of Different Types of Linked Lists<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Singly<\/th><th>Doubly<\/th><th>Circular<\/th><th>Circular Doubly<\/th><\/tr><\/thead><tbody><tr><td>Forward Traversal<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u2705<\/td><\/tr><tr><td>Backward Traversal<\/td><td>\u274c<\/td><td>\u2705<\/td><td>\u274c<\/td><td>\u2705<\/td><\/tr><tr><td>Memory Usage<\/td><td>Low<\/td><td>Medium<\/td><td>Low<\/td><td>High<\/td><\/tr><tr><td>Complexity<\/td><td>Easy<\/td><td>Medium<\/td><td>Medium<\/td><td>High<\/td><\/tr><tr><td>Circular Navigation<\/td><td>\u274c<\/td><td>\u274c<\/td><td>\u2705<\/td><td>\u2705<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Common Operations on a Linked List<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A linked list supports several operations that allow you to manage data efficiently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common operations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Traversal<\/li>\n\n\n\n<li>Insertion<\/li>\n\n\n\n<li>Deletion<\/li>\n\n\n\n<li>Searching<\/li>\n\n\n\n<li>Updating<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s understand each one.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">1. Traversal<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Traversal means visiting every node in the linked list one by one.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Example<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40 \u2192 NULL\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Traversal Output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10\n20\n30\n40\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Steps<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Start from the Head.<\/li>\n\n\n\n<li>Print the data.<\/li>\n\n\n\n<li>Move to the next node.<\/li>\n\n\n\n<li>Repeat until NULL.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Time Complexity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O(n)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">2. Insertion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Insertion means adding a new node to the linked list.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are three common ways to insert a node.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Insert at the Beginning<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Insert 10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Only the Head pointer changes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Time Complexity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O(1)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Insert at the End<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Insert 40<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The last node&#8217;s pointer is updated.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Time Complexity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O(n)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Insert in the Middle<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Insert 30<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Only the pointers are updated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No shifting is required.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">3. Deletion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Deletion removes an existing node.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Delete First Node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Head moves to the next node.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Time Complexity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O(1)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Delete Last Node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The second-last node becomes the last node.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Time Complexity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O(n)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Delete Middle Node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Delete 30<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 40\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The pointers are updated without shifting elements.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">4. Searching<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Searching means finding whether a particular value exists in the linked list.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30 \u2192 40 \u2192 50\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Search for 30.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The algorithm checks:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>10<\/li>\n\n\n\n<li>20<\/li>\n\n\n\n<li>30 \u2714 Found<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Time Complexity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O(n)<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">5. Updating<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Updating means replacing the data stored in a node.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 20 \u2192 30\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Update 20 to 25<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 \u2192 25 \u2192 30\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Time Complexity of Linked List Operations<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Operation<\/th><th>Time Complexity<\/th><\/tr><\/thead><tbody><tr><td>Access<\/td><td>O(n)<\/td><\/tr><tr><td>Search<\/td><td>O(n)<\/td><\/tr><tr><td>Insert at Beginning<\/td><td>O(1)<\/td><\/tr><tr><td>Insert at End<\/td><td>O(n)<\/td><\/tr><tr><td>Delete at Beginning<\/td><td>O(1)<\/td><\/tr><tr><td>Delete at End<\/td><td>O(n)<\/td><\/tr><tr><td>Insert After Known Node<\/td><td>O(1)<\/td><\/tr><tr><td>Delete Known Node<\/td><td>O(1)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Why is Access O(n)?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike arrays, linked lists do not allow direct indexing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To reach the 10th node, you must traverse the first nine nodes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Advantages of Linked Lists<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists are widely used because they solve several limitations of arrays.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Dynamic Size<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You don&#8217;t need to define the size in advance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Memory grows as needed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Fast Insertions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Adding a node only requires changing pointers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No shifting of elements is needed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Fast Deletions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Deleting a node also requires only pointer updates.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Better Memory Utilization<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Memory is allocated only when required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reduces wasted space.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Easy to Implement Other Data Structures<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many advanced data structures are built using linked lists.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stacks<\/li>\n\n\n\n<li>Queues<\/li>\n\n\n\n<li>Graphs<\/li>\n\n\n\n<li>Hash Tables<\/li>\n\n\n\n<li>Adjacency Lists<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Disadvantages of Linked Lists<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Although linked lists are powerful, they also have some drawbacks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. No Random Access<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You cannot directly access any node by its index.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Traversal is required.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Extra Memory<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every node stores an additional pointer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This increases memory usage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Reverse Traversal is Difficult<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In a singly linked list, moving backward is not possible.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Pointer Management<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect pointer handling can cause:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Memory leaks<\/li>\n\n\n\n<li>Lost nodes<\/li>\n\n\n\n<li>Infinite loops<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Linked List vs Array<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding the difference between arrays and linked lists is essential for choosing the right data structure.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Array<\/th><th>Linked List<\/th><\/tr><\/thead><tbody><tr><td>Memory Allocation<\/td><td>Contiguous<\/td><td>Non-contiguous<\/td><\/tr><tr><td>Size<\/td><td>Fixed<\/td><td>Dynamic<\/td><\/tr><tr><td>Insertion<\/td><td>Slow<\/td><td>Fast<\/td><\/tr><tr><td>Deletion<\/td><td>Slow<\/td><td>Fast<\/td><\/tr><tr><td>Random Access<\/td><td>Yes<\/td><td>No<\/td><\/tr><tr><td>Memory Usage<\/td><td>Lower<\/td><td>Slightly Higher<\/td><\/tr><tr><td>Traversal<\/td><td>Easy<\/td><td>Sequential<\/td><\/tr><tr><td>Implementation<\/td><td>Simple<\/td><td>Moderate<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">When Should You Use an Array?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choose an array when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You know the size in advance.<\/li>\n\n\n\n<li>You need fast index-based access.<\/li>\n\n\n\n<li>Insertions and deletions are rare.<\/li>\n\n\n\n<li>Memory efficiency is a priority.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When Should You Use a Linked List?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choose a linked list when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The data size changes frequently.<\/li>\n\n\n\n<li>Frequent insertions and deletions are required.<\/li>\n\n\n\n<li>Memory needs to grow dynamically.<\/li>\n\n\n\n<li>Sequential access is sufficient.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Key Takeaways from This Section<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">By now, you have learned:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The four main types of linked lists.<\/li>\n\n\n\n<li>How insertion, deletion, traversal, searching, and updating work.<\/li>\n\n\n\n<li>The time complexity of common operations.<\/li>\n\n\n\n<li>The advantages and disadvantages of linked lists.<\/li>\n\n\n\n<li>The key differences between arrays and linked lists and when to use each.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Applications of Linked Lists<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists are one of the most widely used data structures in computer science. Their ability to grow dynamically and support efficient insertion and deletion makes them ideal for many real-world applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s explore where linked lists are commonly used.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">1. Music Playlists<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the best real-life examples of a linked list is a music playlist.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Song A \u2192 Song B \u2192 Song C \u2192 Song D\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">When you add a new song between two existing songs, the application only updates the links between songs instead of moving every song in the playlist.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why Linked Lists?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Easy insertion<\/li>\n\n\n\n<li>Easy deletion<\/li>\n\n\n\n<li>Dynamic playlist size<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">2. Browser History<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Every time you visit a webpage, the browser stores it in memory.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Google \u21c4 YouTube \u21c4 Sharpener Tech \u21c4 GitHub\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">When you click:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Back<\/li>\n\n\n\n<li>Forward<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">the browser moves between pages just like a <strong>Doubly Linked List<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">3. Undo and Redo Operations<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Applications like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Microsoft Word<\/li>\n\n\n\n<li>Google Docs<\/li>\n\n\n\n<li>Photoshop<\/li>\n\n\n\n<li>Figma<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">allow users to undo and redo changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Type A\n\n\u2193\n\nType B\n\n\u2193\n\nDelete B\n\n\u2193\n\nInsert Image\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each action points to the previous and next action, making a doubly linked list an ideal choice.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">4. Image Viewer<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose you have an image gallery.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Image1 \u21c4 Image2 \u21c4 Image3 \u21c4 Image4\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Users can navigate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Next image<\/li>\n\n\n\n<li>Previous image<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is another common use case for a doubly linked list.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">5. Operating System Process Scheduling<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Operating systems continuously manage running processes.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P1 \u2192 P2 \u2192 P3 \u2192 P4\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Schedulers often use <strong>Circular Linked Lists<\/strong> to give each process equal CPU time.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">6. Dynamic Memory Allocation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Operating systems use linked lists to manage free and allocated memory blocks efficiently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Instead of reserving a fixed amount of memory, linked lists allow memory to grow or shrink as required.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">7. Hash Tables<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many programming languages use linked lists to resolve collisions in hash tables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Hash Index\n\n\u2193\n\nApple\n\n\u2193\n\nOrange\n\n\u2193\n\nBanana\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If multiple keys map to the same index, they are stored in a linked list.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">8. Graph Representation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Graphs are often represented using <strong>Adjacency Lists<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A \u2192 B \u2192 C\n\nB \u2192 A \u2192 D\n\nC \u2192 A\n\nD \u2192 B\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each vertex stores its connected neighbors using linked lists.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">9. Social Media Feeds<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many social media platforms manage posts dynamically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">New posts are inserted at the beginning, and older posts move down naturally.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists make this operation efficient.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">10. Navigation Systems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Navigation apps maintain a sequence of directions.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Start\n\n\u2193\n\nTurn Left\n\n\u2193\n\nGo Straight\n\n\u2193\n\nTurn Right\n\n\u2193\n\nDestination\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each instruction points to the next, similar to a linked list.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Linked List Program Example in C<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n\nstruct Node {\n    int data;\n    struct Node* next;\n};\n\nint main() {\n\n    struct Node* first = (struct Node*)malloc(sizeof(struct Node));\n    struct Node* second = (struct Node*)malloc(sizeof(struct Node));\n    struct Node* third = (struct Node*)malloc(sizeof(struct Node));\n\n    first-&gt;data = 10;\n    second-&gt;data = 20;\n    third-&gt;data = 30;\n\n    first-&gt;next = second;\n    second-&gt;next = third;\n    third-&gt;next = NULL;\n\n    struct Node* temp = first;\n\n    while(temp != NULL){\n        printf(\"%d \", temp-&gt;data);\n        temp = temp-&gt;next;\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 20 30\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Linked List Example in C++<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nclass Node{\npublic:\n    int data;\n    Node* next;\n\n    Node(int value){\n        data = value;\n        next = NULL;\n    }\n};\n\nint main(){\n\n    Node* head = new Node(10);\n    head-&gt;next = new Node(20);\n    head-&gt;next-&gt;next = new Node(30);\n\n    Node* temp = head;\n\n    while(temp!=NULL){\n        cout&lt;&lt;temp-&gt;data&lt;&lt;\" \";\n        temp=temp-&gt;next;\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Linked List Example in Java<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>class Node{\n\n    int data;\n    Node next;\n\n    Node(int data){\n        this.data=data;\n        this.next=null;\n    }\n}\n\npublic class Main{\n\n    public static void main(String args&#91;]){\n\n        Node head=new Node(10);\n        head.next=new Node(20);\n        head.next.next=new Node(30);\n\n        Node temp=head;\n\n        while(temp!=null){\n\n            System.out.print(temp.data+\" \");\n            temp=temp.next;\n\n        }\n\n    }\n\n}\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Linked List Example in Python<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>class Node:\n\n    def __init__(self,data):\n\n        self.data=data\n        self.next=None\n\nhead=Node(10)\n\nhead.next=Node(20)\n\nhead.next.next=Node(30)\n\ntemp=head\n\nwhile temp:\n\n    print(temp.data,end=\" \")\n\n    temp=temp.next\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Common Linked List Interview Questions<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">If you&#8217;re preparing for software developer interviews, these are some of the most frequently asked linked list questions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Beginner Level<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What is a linked list?<\/li>\n\n\n\n<li>How does a linked list differ from an array?<\/li>\n\n\n\n<li>What are the different types of linked lists?<\/li>\n\n\n\n<li>What is a node?<\/li>\n\n\n\n<li>What is the head pointer?<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Intermediate Level<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reverse a linked list.<\/li>\n\n\n\n<li>Find the middle node of a linked list.<\/li>\n\n\n\n<li>Detect a loop in a linked list.<\/li>\n\n\n\n<li>Delete a node without deleting the head.<\/li>\n\n\n\n<li>Merge two sorted linked lists.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Advanced Level<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Detect and remove cycles.<\/li>\n\n\n\n<li>Clone a linked list with random pointers.<\/li>\n\n\n\n<li>Reverse nodes in groups of K.<\/li>\n\n\n\n<li>Flatten a multilevel linked list.<\/li>\n\n\n\n<li>Implement an LRU Cache using a linked list.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Practicing these questions will strengthen your understanding of linked lists and improve your coding interview performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Best Practices While Working with Linked Lists<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">To write efficient and bug-free code, keep these tips in mind:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Always initialize the head pointer correctly.<\/li>\n\n\n\n<li>Check for <code>NULL<\/code> before accessing the next node.<\/li>\n\n\n\n<li>Update pointers carefully during insertion and deletion.<\/li>\n\n\n\n<li>Free unused memory in languages like C and C++ to avoid memory leaks.<\/li>\n\n\n\n<li>Handle edge cases such as an empty list or a single-node list.<\/li>\n\n\n\n<li>Test your implementation with different input sizes.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Frequently Asked Questions (FAQs)<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1. What is a linked list in data structures?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A linked list is a linear data structure made up of nodes, where each node stores data and a reference (pointer) to the next node. Unlike arrays, linked lists do not require contiguous memory locations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Why are linked lists used instead of arrays?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists are preferred when frequent insertions and deletions are required because they do not need elements to be shifted. They also support dynamic memory allocation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. What are the different types of linked lists?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The four main types are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Singly Linked List<\/li>\n\n\n\n<li>Doubly Linked List<\/li>\n\n\n\n<li>Circular Linked List<\/li>\n\n\n\n<li>Circular Doubly Linked List<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. What is the time complexity of insertion in a linked list?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>At the beginning: <strong>O(1)<\/strong><\/li>\n\n\n\n<li>At the end (without a tail pointer): <strong>O(n)<\/strong><\/li>\n\n\n\n<li>After a known node: <strong>O(1)<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Can linked lists grow dynamically?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. One of the biggest advantages of linked lists is that they can grow or shrink during program execution as memory is allocated when needed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. What is the biggest disadvantage of a linked list?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The biggest disadvantage is that linked lists do not support direct indexing. To access a specific element, you must traverse the list from the beginning, resulting in <strong>O(n)<\/strong> time complexity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. Which industries use linked lists?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Linked lists are used in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Operating systems<\/li>\n\n\n\n<li>Database management systems<\/li>\n\n\n\n<li>Web browsers<\/li>\n\n\n\n<li>Text editors<\/li>\n\n\n\n<li>Image processing software<\/li>\n\n\n\n<li>Network routing<\/li>\n\n\n\n<li>Game development<\/li>\n\n\n\n<li>Compiler design<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A linked list is one of the most important data structures every programmer should master. Unlike arrays, linked lists provide dynamic memory allocation, efficient insertion and deletion, and flexible data organization. These characteristics make them a fundamental building block for many advanced data structures and algorithms.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Throughout this guide, you learned:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What a linked list is and how it works.<\/li>\n\n\n\n<li>The structure of a node.<\/li>\n\n\n\n<li>Different types of linked lists.<\/li>\n\n\n\n<li>Common operations such as insertion, deletion, traversal, searching, and updating.<\/li>\n\n\n\n<li>Time complexity of linked list operations.<\/li>\n\n\n\n<li>Advantages and disadvantages compared to arrays.<\/li>\n\n\n\n<li>Real-world applications.<\/li>\n\n\n\n<li>Programming examples in C, C++, Java, and Python.<\/li>\n\n\n\n<li>Common interview questions and best practices.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A strong understanding of linked lists will help you solve coding problems more effectively and prepare you for technical interviews at leading technology companies. As you continue learning Data Structures and Algorithms, practice implementing linked lists from scratch and solving related coding challenges to build confidence and improve your problem-solving skills.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Start Your Full Stack Development Journey with Sharpener Tech<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Learning data structures like linked lists is a crucial step toward becoming a successful software developer. At <strong>Sharpener Tech<\/strong>, our <strong>Full Stack Developer Course<\/strong> is designed to help beginners and aspiring developers build strong programming fundamentals, master Data Structures and Algorithms, and gain hands-on experience through real-world projects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our curriculum includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HTML, CSS, JavaScript, React, Node.js, and MongoDB<\/li>\n\n\n\n<li>Data Structures and Algorithms<\/li>\n\n\n\n<li>SQL and Database Management<\/li>\n\n\n\n<li>Git and GitHub<\/li>\n\n\n\n<li>Live mentor-led sessions<\/li>\n\n\n\n<li>Real-world projects<\/li>\n\n\n\n<li>Mock interviews and resume preparation<\/li>\n\n\n\n<li>Placement assistance<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you&#8217;re a student, a recent graduate, or a working professional looking to switch careers, Sharpener Tech provides the practical skills and industry-focused training needed to launch a successful career in software development.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you are starting your journey in Data Structures and Algorithms (DSA), one of the first concepts you will learn after arrays is the Linked List. It is one of&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41],"tags":[],"class_list":["post-3610","post","type-post","status-publish","format-standard","hentry","category-full-stack-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linked List in Data Structures: Types, Operations &amp; Examples<\/title>\n<meta name=\"description\" content=\"Learn Linked Lists in Data Structures with simple explanations, diagrams, examples, types, operations, advantages, disadvantages, and coding examples.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sharpener.tech\/blog\/linked-list-in-data-structures\/\" \/>\n<meta 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