+void co_build_ou_structure(copy_opt_t *co);
+
+/**
+ * Frees the space used by the opt unit representation.
+ * Does NOT free the whole copyopt structure
+ */
+void co_free_ou_structure(copy_opt_t *co);
+
+/**
+ * Solves the problem using a heuristic approach
+ * Uses the OU data structure
+ */
+int co_solve_heuristic(copy_opt_t *co);
+
+/**
+ * Apply Park/Moon coalescing to the graph.
+ * @param co The copy optimization data structure.
+ */
+void co_solve_park_moon(copy_opt_t *co);
+
+/**
+ * Solves the copy minimization problem using another heuristic approach.
+ * Uses the OU and the GRAPH data structure.
+ */
+int co_solve_heuristic_new(copy_opt_t *co);
+
+/**
+ * Solves the copy minimization problem using another heuristic approach implemented in Java.
+ * This function needs a JVM which is started to call the Java module.
+ * Uses the GRAPH data structure.
+ */
+int co_solve_heuristic_java(copy_opt_t *co);
+
+/**
+ * This is the pure C implementation of co_solve_heuristic_java().
+ */
+int co_solve_heuristic_mst(copy_opt_t *co);