fix bug where starting index was set incorrectly when populating graph

include/state_manager.hpp

@@ -34,7 +34,7 @@ private:
     std::unordered_set<size_t>
         path_indices; // For faster lookup if a vertex is part of the path in renderer
 
-    std::stack<size_t> move_history; // Moves between the starting state and the current state
+    std::vector<size_t> move_history; // Moves between the starting state and the current state
     std::unordered_map<size_t, int> visit_counts; // How often each state was visited
 
     size_t starting_state_index = 0;