generate all subsets of size k from a set

Question

I want to generate all the subsets of size k from a set.

eg:-say I have a set of 6 elements, I have to list all the subsets in which the cardinality of elements is 3

Answer 1

Here is an Iterative solution :

#include 
#include 
void printer(int locations[],int a[],int r)
{
    int i;
    for(i=0; i0; i--)
        {
            if(locations[i-1]