Popping elements from the stack and updating pointers: In the second pass, we pop elements from the stack and adjust the pointers to reverse the linked list. Since this involves visiting every node once, the time complexity of this step is O(N). Pushing all elements onto the stack: In the first pass, we traverse the entire linked list, pushing each node onto the stack. Here’s a high-level explanation of why the time complexity is O (N): The time complexity of reversing a linked list using a stack is O(N), where N is the number of elements (nodes) in the linked list. Time complexity of reversing a linked list using stack Implementation on How to Reverse a Linked List using Stack Once the stack is empty, we will have the required reversed linked list.ĭry Run on How to Reverse a Linked List using Stack.Now, start popping the elements from the stack and iterating through the linked list together, and change the values in the nodes by the values we get from the stack.Now, after the iteration is complete, the linked list is stored in reverse order in the stack.Iterate through the linked list and push the values of the nodes into the stack.If yes, then no need to reverse it and simply return from the function. Check if the linked list is empty or has a single node.Algorithm on How to Reverse a Linked List using Stack. In all other cases, we need to reverse the linked list. In case, the linked list is empty or has only one node, reversing the linked list won’t make any change. So, due to its LIFO property, a stack is able to store elements in reverse order of their insertion and hence can be used to solve our problem.Ĭan you think of a case where we don’t need to reverse a linked list? And similarly, if we remove elements from the stack, we will get them in the reverse order of insertion. This means the element inserted at the last will be accessible to us. It follows the LIFO(last in first out) principle. Approach on How to Reverse a Linked List using Stack. We will look for that under Approach section. Now, the main question is how to use a stack to reverse a linked list? A stack is a Last-In-First-Out (LIFO) data structure, meaning that the last element added to the stack is the first one to be removed. One approach to reversing a linked list is by using a stack. Reversing a linked list means changing the order of the nodes so that the last node becomes the first node, the second-to-last node becomes the second node, and so on, resulting in a completely reversed sequence. The last node in the list points to None, indicating the end of the list. How to Reverse a Linked List using StackĪ linked list is a data structure that consists of a sequence of nodes, where each node contains data and a reference (or link) to the next node in the sequence. Let’s embark on this journey to unveil the magic of reversing a Linked List using a stack. In this article, we’ll delve into the implementation of this straightforward yet powerful technique, exploring how to reverse a linked list using stacks, ensuring that the process is both intuitive and resource-friendly. A stack is a data structure that follows the Last-In-First-Out (LIFO) principle, making it ideal for reversing the order of elements in a Linked List. Reversing a Linked List is a common operation in computer science, and one effective approach to achieve this is by utilizing a stack.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |