vector<vector<int>> transpose(vector<vector<int>>& A) {

    vector<vector<int>> V;

    int RowLen = A.size();

    int ColLen = A[].size();

    for (int j = ; j < ColLen; j++)

    {

        vector<int> v;

        for (int i = ; i < RowLen; i++)

        {

            v.push_back(A[i][j]);

        }

        V.push_back(v);

    }

    return V;

}