vector<int>v1{ 54,54,546,65,5,5454,35,7 }; vector<int>v3{}; for (auto it : v1) //ни так v3.insert(it); for (auto i = v1.begin(); i != v1.end(); ++i) //ни так v3.insert(*i);

    2 answers 2

    First, insert for a vector requires two parameters - where to insert, and what to insert. You transmit just now .

    Secondly, do not use insert with a vector at all - except in the most extreme cases ... limit push_back() .

    And in general, in your particular case, a simple assignment is sufficient -

     v3 = v1;

    If you really want to insert - then it's better

     v3.insert(v3.end(),v1.begin(),v1.end());

      The insert method requires you to specify where to insert the item. If you need to add to the end:

       vector<int>v1{ 54,54,546,65,5,5454,35,7 }; vector<int>v3{}; for (auto it : v1) v3.push_back(it); for (auto i = v1.begin(); i != v1.end(); ++i) v3.push_back(*i); for (auto it : v1) v3.insert(v3.end(), it);