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Reverse Alternate K Nodes in a Singly Linked List

Explore how to reverse every k nodes in a singly linked list by breaking the list into sublists and manipulating pointers. Learn to track heads and tails of sublists to reconnect them properly, understand the role of pointers in the process, and analyze the time and space complexity of this linear-time algorithm.

Statement

Given a singly linked list and an integer k, write a function to reverse every k element.

  • If k<=1k <= 1, then the input list is unchanged.
  • If k>=nk >= n (
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