374. Reverse Nodes in K-Groups
HardLinked List
Reverse the nodes of the list k at a time; a final group with fewer than k nodes stays as it is. Print the list.
Input format
Line 1: n k Line 2: n values
Output format
The modified list.
Example 1
Input
5 2 1 2 3 4 5
Output
2 1 4 3 5
Example 2
Input
5 3 1 2 3 4 5
Output
3 2 1 4 5
Constraints
1 ≤ k ≤ n ≤ 10⁵
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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