Solution: Reverse Nodes in k-Group

Explore how to reverse nodes in groups of k in a linked list by using an in-place manipulation technique. Understand the step-by-step solution that reverses each group without extra memory allocation, checks group sizes, and efficiently reattaches reversed segments to maintain list integrity.

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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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