There is a door (door is closed) and 3 lights, and there are three switches on the outside, which are connected to the three lights respectively.You can manipulate these switches at will, but once you open the door, you can not change the switch. Each switch which tube which tube.
Suppose the house lights for a, b, c, corresponding to the switch A, B, C; first open the switch A, 10 minutes after the closure of A, open B, the door is bright b, hot is a cold is c.
Hard toss a switch, so that a light burned; the second switch to put it in the middle, then the corresponding will always flash; the last switch is open, the corresponding light has been lit;
