Function added to associate graph with the solver

include/gp-bnb/bnb.hpp

@@ -106,6 +106,9 @@ struct solver {
 	// Expand a search tree node, i.e., assigns an node to a partition and update all data structures.
 	void expand(vertex_id node, partition_index p);
 
+	//associates graph with the solver
+	void define_graph(graph& g);
+
 	// Performs backtracking after the solver ran into a dead end,
 	// i.e., the current branch has been pruned.
 	void backtrack();