vector>> vec(10, vector>(5, pair(0, 0)));

    for (int i = 0; i < vec.size(); i++)
    {
        for (int j = 0; j < vec[i].size(); j++)
        {
            cout << vec[i][j].first << " ";
            cout << vec[i][j].second << " ";
        }
        cout << endl;
    }