time was so important for robot, it did not detect the location of each ball
separately and only tried to sweep the ground without pay attention to
location of each ball.
robot had two arms that opened in the specified time. They expanded the robot's
width for maximizing the scan area. They guided the balls to front of
the sweeper. So robot could complete gathering all balls in one stage.
had one sweeper in the front that grabbed every ball which placed in front
of it. The mechanical design of sweeper was so precise and thoughtfully.
was in the back of the robot that opened the door and made a slope to move
all stored balls to the goal.