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Data Structures for Coding Interviews in Java

Solution: Reverse Linked List

Explore how to reverse a singly linked list by iteratively updating node pointers without extra data structures. Learn to use three pointers to traverse and reverse the list with linear time complexity and constant space, gaining a foundational skill for coding interviews.

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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.

  • 1≤1 \leq n ≤5×102\leq 5\times10^2
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