Leetcode Problem 25. Reverse Nodes in k-Group

25. Reverse Nodes in k-Group

Leetcode Solutions

Initialize three pointers: prevTail to keep track of the tail of the previous reversed group, currentHead to mark the start of the current group, and nextHead to mark the start of the next group.
Iterate over the linked list, and for each group of k nodes, reverse the group. Keep track of the new head and tail of the reversed group.
Connect the prevTail to the new head of the reversed group.
Update prevTail to the new tail of the reversed group.
Move to the next group of k nodes by setting currentHead to nextHead.
Repeat steps 2-5 until the end of the list is reached.
If the last group has fewer than k nodes, do not reverse it.
Return the new head of the modified list.

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