#include <iostream>
#include <vector>
using namespace std;

template < typename T >
    void swap( T & a, T & b );

void wektor_odwrocony(vector<int> v){
     cout << "Poprawna kolejnosc to: "<< endl;
     for(int i = 0; i < v.size(); i++){
             cout << v[i] << " ";
     }
     cout << endl;
     cout << "Odwrocona kolejnosc, przez skorzystanie z pomocniczego wektora, to: "<<endl;
     vector<int> v2;
     for(int i = v.size()-1; i >= 0 ; i--){
             v2.push_back(v[i]);
     }
     for(int i = 0; i < v2.size(); i++){
             cout << v2[i] << " ";
     }
     cout << endl;
}
void odwrocona_kolejnosc(vector<int> v){
      cout << "Poprawna kolejnosc to: "<< endl;
      for(int i = 0; i < v.size(); i++){
             cout << v[i] << " ";
      }
     cout << endl;
     cout << "Odwrocona kolejnosc, bez skorzystania z pomocniczego wektora, przez swap to: "<<endl;
     int ile = v.size()/2;
     int j = v.size()-1;
     for(int i = 0; i < ile ; i++){
         std::swap( v[i],v[j]);
         j--;
     }
     for(int i = 0; i < v.size(); i++){
               cout << v[i] << " ";
     }
     cout << endl;

}
int main()
{

    vector<int> v;
    v.push_back(2);
    v.push_back(3);
    v.push_back(6);
    v.push_back(20);
    v.push_back(4);
    v.push_back(10);
    v.push_back(12);
    wektor_odwrocony(v);
    cout << endl;
    odwrocona_kolejnosc(v);
    system("pause");
}