int nr_nodes = xbt_dynar_length(nodes);
cost_arr = xbt_new0(double, nr_nodes); /* link cost from src to other hosts */
pred_arr = xbt_new0(int, nr_nodes); /* predecessors in path from src */
int nr_nodes = xbt_dynar_length(nodes);
cost_arr = xbt_new0(double, nr_nodes); /* link cost from src to other hosts */
pred_arr = xbt_new0(int, nr_nodes); /* predecessors in path from src */