tut12-zad3

#include <iostream>
#include <iomanip>
#include <stdexcept>
#include <cmath>
#include <set>


using namespace std;

template<typename T>
set<T> operator+ (const set<T> &s1, const set<T> &s2) {
set<T> pom;
for (auto x: s1) pom.insert(x);
for (auto x: s2) pom.insert(x);
return pom;
}

template<typename T1>
set<T1> operator*( const set<T1> &s1, const set<T1> &s2) {
    set<T1> pom;
    for (auto x: s1) {
            for (auto y:s2) {
                if (x==y) pom.insert(x);
            }}
            return pom;
}
template<typename T2>
ostream &operator<<(ostream &tok, const set<T2> s)
{ tok<<"{";
auto it(s.begin());
for (int i=0; i<s.size()-1; i++)
        tok<<*it++<<",";
tok<<*it<<"}";
return tok;
}
int main() {
  set<int> s1{3, 5, 1, 2, 8}, s2{7, 2, 8, 4};
cout << s1 + s2 << std::endl;
cout << s1 * s2 << std::endl;
        return 0;

}