solution
Label each one of the switches 1, 2 and 3. Switch on switches 1 & 2, wait a moment and switch off number 2. Enter the room. Whichever bulb is on is wired to switch 1. Then, touch the other two bulbs. Whichever is off and hot is wired to switch number 2, and the other that is off and cool is wired to switch 3!