A spinning disc is painted black on one half and white on the other (i.e., the line forming the border between the black and white regions of the disc is a diameter of the disc).
The disk is spinning on a turntable in an unknown direction at an unknown speed. You have special video cameras that can observe the color of a single point on the disc.
How many cameras do you need to determine the direction the disc is spinning?
Answer is a integer. Just put the number without any decimal places if its an integer. If determining the direction is not possible, output Infinity.
Feel free to get in touch with us if you have any questions