void set_allowed_motion(int from_location, int to_location, int v);
void set_as_entrance(int location, int v);
void set_as_exit(int location, int v);
void set_allowed_motion(int from_location, int to_location, int v);
void set_as_entrance(int location, int v);
void set_as_exit(int location, int v);
int trajectory_duration(int k);
int trajectory_location(int k, int time);
};
int trajectory_duration(int k);
int trajectory_location(int k, int time);
};