Solution: Reverse Nodes in k-Group

Explore how to reverse nodes in a linked list in groups of k by manipulating pointers directly without extra memory. Understand how to check group sizes, reverse groups in place, reattach them, and repeat this to handle the entire list efficiently. This lesson helps you master linked list manipulations with optimal time and space complexity suitable for coding interviews.

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Statement
Solution
- Naive approach
- Optimized approach using in-place manipulation of a linked list

Statement

The task is to reverse the nodes in groups of $k$ in a given linked list, where $k$ is a positive integer, and at most the length of the linked list. If any remaining nodes are not part of a group of $k$ , they should remain in their original order.

It is not allowed to change the values of the nodes in the linked list. Only the order of the nodes can be modified.

Note: Use only $O(1)$ extra memory space.

Constraints:

Let n be the number of nodes in a linked list.

$1 \leq$ k $\leq$ n $\leq 500$

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