reversArrayInGroups.cpp

#include <iostream>
using namespace std;

void printArrayReverse(int arr[], int start, int end) {
    for(int i = end ; i >= start; i--) {
        cout<<arr[i]<<" ";
    }
}
int main() {
	//code
	int testCases;
	cin>>testCases;
	for(int i = 0 ; i < testCases; i++) {
	    int n,k;
	    cin>>n;
	    cin>>k;
	    int arr[n];
	    for(int j =0 ; j < n ; j++) {
	        cin>>arr[j];
	    }
	    int p = k-1, q = 0;
	    while(p < n ){
	        printArrayReverse(arr, q, p);
	        q+=k;
	        p+=k;
	    }
	    printArrayReverse(arr,q, n-1);
	    cout<<endl;
	}
	return 0;
}