Reverse a Doubly Linked List
Doubly Linked List: Fundamentals DSA practice problem on Onlearn.
Difficulty: medium.
Topics: How to reverse a doubly linked list of size N consisting of positive integers and return the head of the modified doubly linked list., Doubly Linked List, Linked List, Node, Pointer, Stack, Time Complexity, Space Complexity, Big O Notation, Brute Force, In-place Algorithm, in-place algorithms, complexity analysis, stack, pointer operations, linked list.
Problem Statement Given a doubly linked list of size 'N' consisting of positive integers, your task is to reverse it and return the head of the modified doubly linked list. Input Specification The input will be a doubly linked list. Output Specification The output should be the head of the reversed doubly linked list. Constraints The doubly linked list will consist of positive integers. N is a positive integer representing the size of the doubly linked list. Example 1: Input Format: Output Format: Explanation: The doubly linked list is reversed and its last node is returned as the new head pointer. Example 2: Input Format: Output Format: Explanation: In this case, the doubly linked list is reversed and its former tail is returned as its new head.