Salut!
Ai rezolvarea mai jos
#include <iostream>
using namespace std;
int main()
{
int a, b, c;
cin >> a >> b >> c;
cout << a << b << c << " " << a << c << b << " " << b << a << c << " " << b << c << a << " " << c << a << b << " " << c << b << a;
return 0;
}