struct Vertex
{
    int x, y, id, comp;
    Vertex(int x, int y, int id)
        :x(x), y(y), id(id)
    {}
};

struct Line
{
    vector<Vertex> *arr;
    bool swapped = false;

    Vertex first()
    {
        Vertex v = (swapped ? (*arr)[arr->size() - 1] : (*arr)[0]);
        cout << "first" << v.x << ' ' << v.y << endl;
        return v;
    }

    Vertex last()
    {
        Vertex v = swapped ? (*arr)[0] : (*arr)[arr->size() - 1];
        cout << "last" << v.x << ' ' << v.y << endl;
        return v;
    }

    Line(vector<Vertex> *narr, bool x)
    {
        if (narr->size() < 2)
        {
            cout << "noooo!";
            while (1);
        }
        arr = narr;
    }
};
int main()
{
 //just piece
        vector<vector<Vertex>> stupid;
        //fill stupid
    vector<Line> smart;
    for (vector<Vertex> vv : stupid)
    {
        //cout << vv.size() << endl;
        if (vv.size() >= 2)
        {
            //cout << tostr(vv);
            Line l(&vv, true);
            cout << l.arr->size() << endl;
            smart.push_back(l);
            cout << smart[smart.size() - 1].arr->size();
        }
    }
    for (int i = 0; i < smart.size(); ++i)
        cout << smart[i].arr->size() << endl;
}