ArticlesDigital MarketingTechnology How Would You Reverse A Linked List? by News Line April 15, 2022 written by News Line April 15, 2022 18 views 18 How Would You Reverse A Linked List? Reversing the linked list is the most critical and exciting data structure and algorithms issue. The lack of awareness about the reverse linked list is the primary reason behind the problem. Here, reversing the linked list means reassigning all the following properties on each node. Do you want to know in-depth about how to change the linked list? Scroll down the page. What Does The Reverse Linked List Mean? The reverse linked list is the link list developed to form the linked list by reversing the list’s links. The head node of the linked list will become the last note of the linked list and vice versa. In simple words, the node present in the terminal end will come to the front. You can reverse the linked list using recursion and iterative methods. Here is an example of a reverse linked list. Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL It is necessary to use three extra pointers that will be in the process to reverse the given linked list. The pointers will be current, previous, and after. Initially, you have to initialize previous and after to NULL. Then, initialize current to the head of the linked list. Next, you must iterate until reaching the NULL of the initial. It is precisely the same mentioned below. after = current -> next current -> next = previous previous = current current = after Different Ways To Reverse The Linked List You can reverse the linked list either using the iterative approach or the recursion approach. In the following section, you will learn in-depth about both processes. You can choose the specific method and then reverse the linked list according to your requirements. Iterative Approach In this way, the new linked list will create, and all the elements of the first linked list will add to the new linked list in the reversal order. It is the most efficient way among the methods listed here. Although objects of every node are copied to memory, the new linked list node creates for every call to add a property. It needs at least three-pointers to create the new link list. Even though this method does not waste memory, it consumes more processing power. Read also What are Solid State Drives (SSDs)? When the linked list has two or more elements, three-pointers must be used to implement the iterative solutions. Ensure you use the function to reverse the linked list. Then, you have to pass the head pointer as the sole argument. It will return to the head of the reversed list. Afterward, you must assign three nodes – prev (with null pointers), current (concerning the head node), and temp. Access the while loop to traverse the linked list until the next pointer does not yield NULL. The following operations will perform in the iterative process. temp = current->next; Assigns temp node to the current node’s next node current->next = prev; Assigns current node to the previous node’s next node prev = current; Increments previous node to current node current = temp; Increments current node to temp node Finally, you will return to the head node of the reversed list. It indicates the completion of the process of reversing the linked list. Steps To Follow If you choose the iterative approach to reverse the linked list, you should carefully follow these steps. Take the three-pointers and initialize them like previous = NULL, next = NULL, and current = head. Use the loop to iterate the linked list and then perform the below-mentioned. // before changing the next of the current, // keep the next node next = current -> next // Now changing the next of current // it is where the reversing takes place current -> next = previous // Moving the previous and current forward for one step Previous = current Current = next Recursion Approach You have to divide the linked list into two parts – the head and the remaining. Initially, the head points to the first element, and the next element from the head indicates the remaining. After the reversal, the next mode of the head will become the last node. Then, the head will point to that node. However, the head must be the last node for the complete reversal linked list. After that, link the rest to the first and fix the head pointer. Follow the below operation to ensure this. head.next.next = head head.next = NULL Note: You should save the copy of the head so as not to lose track of the original head. The recursive solution accesses the stack because the recursive solution will run out of memory, especially when working with an extensive linked list. So, every recursive call needs your complicate to allocate the stack memory. It would help if you visited every node in the given linked list until reaching the last node to return the head of the new linked list. Then, this node serves as the new head of the linked list. Every node appends itself to the end of the partially reversed list on the return path. It means every node should iterate through every element at least once. How To Reverse The Linked List Using Stack When you decide to reverse the linked list using stack, you should follow these steps. Keep the nodes’ values in the stack until you enter all the nodes’ values. Use the value of the last note of the linked list to update the head pointer. Keep eliminating the value of the nodes from the stack and begin adding them to the head stack, which is empty. As soon as the appending work is completed, the last node of the linked list points to NULL. It means the reversal process using the stack is successful. Use The Swapping Method To Reverse The Link List. You can even use another technique to reverse the linked list. In that method, you will swap linked list note objects. You can start the swapping from the first node’s object, and the object of the first node is swapped with the last node’s object. After that, the object of the second note is swapped with the one before the last node’s element. The swapping process goes on until it reaches the linked list’s middle. It is one of the fastest and most optimized reversing the linked list. The overhead of the algorithm is locating the end of the linked list. Whether or not you have prior knowledge on reversing the linked list, it is better to seek professional assistance. So, contact JDM Web Technologies today. 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