bilet1/3

#include <iostream>
#include <string>
#include <set>
#include <algorithm>
#include <iterator>

std::set<int> Union(std::set<int>& s1,std::set<int>& s2) {
    std::set<int> s;
    std::set_union(s1.begin(), s1.end(),s2.begin(), s2.end(), std::inserter(s,s.begin()));
    return s;
}

int main() {
    std::set<int> s1;
    std::set<int> s2;
    std::set<int>::iterator it;
    s1.insert(1);
    s1.insert(2);
    s1.insert(3);
    s1.insert(4);
    s2.insert(5);
    s2.insert(6);
    s2.insert(7);
    s2.insert(8);
    std::set<int> result = Union(s1,s2);
    for (it = result.begin(); it != result.end(); ++it) std::cout << *it << " ";
}