std::vector<boost::dynamic_bitset<>> simple_graph::get_sub_graph(const std::vector<boost::dynamic_bitset<>>& t_adjacency_matrix, const std::vector<int> vertex_list)
{
    std::vector<boost::dynamic_bitset<>> adjacency;
    const int size = vertex_list.size();
    adjacency.resize(size, boost::dynamic_bitset<>(size));

    int i = 0;

    for (auto u : vertex_list)
    {
        int j = 0;
        for (auto v : vertex_list)
        {
            adjacency[i][j] = t_adjacency_matrix[u][v];
            adjacency[j][i] = t_adjacency_matrix[v][u];

            ++j;
        }
        ++i;
    }

    return adjacency;
}