t7-zad3

#include<iostream>
#include <list>
#include <algorithm>

template <typename T>
 std::set<T>  Unija ( const std::set<T> &s1, const std::set<T> &s2)
 {  std::set<T> s3;
     auto it1(s1.begin());
     auto it2(s2.begin());
     while (it1!=s1.end() && it2!=s2.end()) {
        if (*it1<*it2)
        s3.insert(*it1++);
        if (*it2<*it1)
            s3.insert(*it2++);
        else
        { s3.insert(*it1++);
        it2++;

     }
     while (it1!=s1.end())
     {
         s3.insert(*it1++);
     }
     while (it2!=s2.end())
        s3.insert(*it2++);

     return s3;
 }

 template <typename selma>
 std::set <selma> Presjek (const std::set<selma> &s1, const std::set<selma> &s2)
 {
     std::set<selma> s3;
     auto it1(s1.begin()); auto it2(s2.begin());
     while (it1!=s1.end() && it2!=s2.end()) {
        if(*it1<*it2)
            it1++;
        if (*it2<*it1)
            it2++;
        else {
            s3.insert(*it1++);
            i2++;
        }
     }
     return s3;
 }