Function added to associate graph with the solver

bnb/bnb.cpp

@@ -64,6 +64,10 @@ void solver::resize_nodes(size_t count) {
 	assignment_.resize_nodes(count);
 }
 
+void solver::define_graph(graph& g){
+	nodes_ = g;
+}
+
 void solver::solve() {
 	//anfangs upper bound?
 	best_objective_ = nodes_.num_vertices();