Solution: Reverse Linked List
Explore how to reverse a singly linked list by manipulating pointers in place without extra memory. Understand the step-by-step algorithm involving three pointers and how it achieves O(n) time and O(1) space complexity. This lesson helps you implement an optimized linked list reversal suitable for coding interviews.
Statement
Given the head of a singly linked list, reverse the linked list and return its updated head.
Constraints:
Let n be the number of nodes in a linked list.