(The title is from ACwing)
Have you played the “pull the light” game? The 25 lights are arranged in a 5×5 square. Each light has a switch, and the player can change its state. At each step, t
(The title is from ACwing)
Have you played the “pull the light” game? The 25 lights are arranged in a 5×5 square. Each light has a switch, and the player can change its state. At each step, t