TUTORIJAL 12 zadatak 3

#include <set>
#include <iostream>

using namespace std;

set<int> operator+(std::set<int> s1, std::set<int> s2)
{
    set<int> unija;
    for(auto it = s1.begin(); it!=s1.end(); it++)
    {
        unija.insert(*it);
    }
    for(auto it = s2.begin(); it!=s2.end(); it++)
    {
        unija.insert(*it);
    }
    return unija;
}

set<int> operator*(std::set<int> s1, std::set<int> s2)
{
    set<int> presjek;
    for(auto it = s1.begin(); it!=s1.end(); it++)
    {
        for(auto it1 = s2.begin(); it1!=s2.end(); it1++)
        {
            if(*it1 == *it)
                presjek.insert(*it);
        }
    }
    return presjek;
}

std::ostream &operator <<(std::ostream &tok, const std::set<int> &s1)
{
    auto it_end(s1.end());
    it_end--;
    tok<<"{";
    for(auto it = s1.begin(); it!=s1.end(); it++)
    {
        if(*it == *it_end)
            tok<<*it;
        else tok<<*it<<", ";
    }
    tok<<"}";
    return tok;
}
int main()
{
    std::set<int> skup1 {2,8,5,6,9,10};
    std::set<int> skup2 {1,2,5,7,11,45};
    cout<<skup1<<endl;
    cout<<skup2<<endl;
    cout<<skup1*skup2<<endl;
    cout<<skup1+skup2;

}