extern "C" int GetX();

extern "C" int GetY();

extern "C" int GetZ();

extern "C" int GetNextContainer();

extern "C" int GetNextAction();

extern "C" int GetNextStorageTime();

extern "C" void RefuseContainer();

extern "C" void StoreArrivingContainer(int x, int y);

extern "C" void RemoveContainer(int x, int y);

extern "C" int MoveContainer(int x1, int y1, int x2, int y2);