![]() Can you implement a stack using a doubly linked list? If you want to solve more questions on Linked List, which are curated by our expert mentors at PrepBytes, you can follow this link Linked List. This is a must-do problem as it requires the basic concepts of the doubly linked list. So, in this article, we have tried to explain the most efficient approach to implement a stack using doubly linked list in python. Time Complexity To Build A Stack Using Doubly Linked List: O(n), as list traversal is needed. Print("\nstack is empty:", stack.isEmpty()) Print("Size of the stack is ", stack.size()) Print("Stack operations using Doubly LinkedList") Dry Run To Build A Stack Using Doubly Linked ListĬode Implementation To Build A Stack Using Doubly Linked List So, to do the same with a doubly-linked list, we will simply do a list traversal and print the elements one by one. In the Printstack() function, we have to print the stack. If the head is Null, we will return true.So, to do the same with a doubly-linked list: In the isEmpty() function, we have to return true if the stack is empty, else false. In the end, we will return the counter, as that will be the size of the list. ![]() Then we will traverse through the list and increment the counter by 1 till we reach the end. So, to do the same with a doubly-linked list, we will simply create a counter and initialize it with 0. In the size() function, we have to return the size of the stack. So, to do the same with a doubly-linked list, we will simply return the head.data. In the top() function, we have to return the top element of the stack. In the end, we will return the head.data that we stored. Now, we will increment the head, and make the prev of head point to Null. If both the base cases fail, we will store the head.data.If there is only one node in the list, then remove the head, and return None.So, to do the same with a doubly-linked list, first, we will check if the list is Null or not: In the pop() function, we pop the topmost element of the stack and print it. In the end, the new node will become the head. If the list is not empty, then make the prev of head point to the new node, the next of new node point to the head and the prev of new node point to Null.If it is Null, then make the new data the head.So, to do the same with a doubly-linked list, we will check if the list is Null or not: In the push() function, we push the element into the stack, and make it the top. We will learn how each function approaches one by one. Algorithm To Build A Stack Using Doubly Linked List If input is 5 6 7 8, the the doubly linked list having all the functionalities of the stack will be Where the head will be pointing to 1 in the linked list. If our input is 4 3 2 1, then our doubly linked list, which will have all functionalities of a stack, will be Similarly, we will try to think of other operations such as pop(), top(), etc of stack and how we can implement these operations using doubly linked list. If we can amend the inserting new node operation in doubly linked list such a way that the current inserted element is always at the head of the linked list and is the first element accessible to us if we want to access an element from linked list, then we can see that our linked list is mimicking the behavior of stack. next, which points to the node next to the current node in the linked list.prev, which points to the previous node in the linked list.A doubly linked list has two pointers for every node: Now, lets recall what a doubly-linked list is. This means the element inserted at the last will be accessible to us. It follows the LIFO(last in first out) principle. In this problem, we have to implement a stack, with the help of a doubly linked list.įor the input 4 3 2 1 our doubly linked list, which will have all functionalities of a stack, will beĪnd 1 will be the head of the linked list. How To Build A Stack Using Doubly Linked List “To Build A Stack Using Doubly Linked List In Python”. Building a stack using doubly linked list will enhance your skills in data structures like stack, linked list and using them to perform certain tasks. For web scraping, web automation, web development, game development, machine learning and data analysis and lots more. Python is a vast language which is used for multi purposes i.e. In this blog, our aim is to build a stack using doubly linked list in Python.
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