Originally posted by Natural Science
I know what the original problem is, as stated by the original poster. But this problem existed before the original poster posted it. In the version that I know, all of the lights are in one room, and you can go into that room only once. The advantage of telling it this way, instead of having the three lights on three seperate floors, is that you ...[text shortened]... ach floor only once" mandate. The disadvantage is....well, actually there is no disadvantage.
Oh, you're talking about another problem, do you? With no floors?
Oh yes, then you have another solution also, do you?
Teacher: "When was the great earthquake at San Fransico?"
Teacher: "Well, not quite."
Pupil: "Perhaps, but my father was born then! So, of course the answer is right, but the question was wrong!"
One problem, one solution.
Another problem, another solution.