dynar_nodes = xbt_graph_get_nodes(platform_graph);
xbt_dynar_foreach(dynar_nodes, i, first_node) {
xbt_dynar_foreach(dynar_nodes, j, second_node) {
dynar_nodes = xbt_graph_get_nodes(platform_graph);
xbt_dynar_foreach(dynar_nodes, i, first_node) {
xbt_dynar_foreach(dynar_nodes, j, second_node) {