class graph {
public:
   // Constructors
   graph() {}
   graph(const int processes, const int resources);
   // Initializers:
   void read(std::string filename);
   // check functions:
   //   is the graph...
   bool reducible();// ?
   bool knotted();// ?

   struct m{
      int x, y;
      std::vector<std::vector<int>> data;
   };

private:
   int num_processes = 0;
   int num_resources = 0;
   std::vector<int> resource_counts;
   struct m matrix; // Tell me, Mr. Anderson, what good is a phone call if you are unable to speak?
   bool is_blocked(int process_id);
};