833. Reverse k Sized Sublists
0
Hard
Given a singly linked list of size N, you need to reverse the nodes of the linked list in groups of size K. If the length of the linked list is not a multiple of K, the remaining part should be left unchanged.
Input Format
The first line contains two space-separated integers N and K. The second line contains N space-separated integers representing the elements of the singly linked list.
Output Format
Print the modified linked list.
Example
Input
5 2
1 2 3 4 5
Output
2 1 4 3 5
Constraints
1<=N<=10^5
1<=K<=N
Elements of the linked list range from -10^9 to 10^9
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