Reverse alternate K nodes in a Linked List
Example 1
Linked List Element : 1 2 3 4 5 6 7 8 9 10
Reverse alternate 3 nodes
Linked List Element : 3 2 1 4 5 6 9 8 7 10
Problem is based on reversing node link not node value. For example.

In case group of alternate nodes are less than k in this case not reverse this group. For example.
Example 2
Before reverse alternate 4 nodes
1 2 3 4 5 6 7 8 9 10
① ② ③ ④ (k = 4)
Reverse 4 nodes
4 3 2 1 5 6 7 8 9 10
⤑ ⤑ ⤑ ⤑ Skip k nodes
4 3 2 1 5 6 7 8 9 10
① ② (k = 4)
(2 nodes less than k)
So it's not reverse
Here given code implementation process.
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