int nr_nodes = xbt_dynar_length(nodes);
std::vector<double> cost_arr(nr_nodes); /* link cost from src to other hosts */
pred_arr.resize(nr_nodes); /* predecessors in path from src */
int nr_nodes = xbt_dynar_length(nodes);
std::vector<double> cost_arr(nr_nodes); /* link cost from src to other hosts */
pred_arr.resize(nr_nodes); /* predecessors in path from src */