int main(){

    const int row = 5;
    const int col = 10;
    vector <int> vectorOne;
    vector <vector <int>> vectorTwo;

// попытка сделать через итераторы
    vectorTwo.resize(row);
    for (vector<vector<int>>::iterator x = vectorTwo.begin(); x != vectorTwo.end(); ++x){
        (*x).resize(col);
        for (vector<int>::iterator y = vectorOne.begin(); y != vectorOne.end(); ++y){
            (*y).push_back(2);
        }
        vectorTwo.push_back(vectorOne);
        vectorOne.clear();
    }

// через известные размерности
    vectorTwo.resize(row);
    for (decltype(vectorTwo.size()) x = 0; x != row; ++x){
        vectorTwo[x].resize(col);
        for (decltype(vectorTwo[x].size()) y = 0; y != col; ++y){
            vectorOne.push_back(x+y+2*x);
            cout << vectorOne[y] << " ";
        }
        cout << endl;
        vectorTwo.push_back(vectorOne);
        vectorOne.clear();
    }
}