Reverse array in groups | Practice | GeeksforGeeks

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Given an array arr[] of positive integers of size N. Reverse every sub-array group of size K.

 

Example 1:

Input:
N = 5, K = 3
arr[] = {1,2,3,4,5}
Output: 3 2 1 5 4
Explanation: First group consists of elements
1, 2, 3. Second group consists of 4,5.

 

Example 2:

Input:
N = 4, K = 3
arr[] = {5,6,8,9}
Output: 8 6 5 9

 

Your Task:
You don’t need to read input or print anything. The task is to complete the function reverseInGroups() which takes the array, N and K as input parameters and modifies the array in-place. 

 

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

 

Constraints:
1 ≤ N, K ≤ 107
1 ≤ A[i] ≤ 1018





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