/******************************************************************************
Online C++ Compiler.
Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.
*******************************************************************************/
#include <iostream>
using namespace std;
void perm(int* a, int n, int k, int i)
{
if(i == 0)
{
for(int j=n; j<n+k; j++) cout << a[j] << " ";
cout << endl;
return;
}
for(int j=0; j<n; j++)
{
swap(a[j], a[n-1]);
perm(a, n-1, k, i-1);
swap(a[j], a[n-1]);
}
}
int main()
{
int n = 4, k = 2;
int a[] = {1,2,3,4};
perm(a, n, k, k);
return 0;
}
