GeneralSolvesv1

Identify one bulb using three switches

Heat provides a second observable state.

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Output
The controlling switch identified in one visit
Input
Three switches outside a room and one bulb inside
Relationship

What connects the input and output?

Turn on switch one for several minutes, turn it off, turn on switch two, then enter. A lit bulb maps to two, a warm unlit bulb to one, and a cool unlit bulb to three.

Sources

1
  1. en.wikipedia.org: Identify one bulb using three switchesen.wikipedia.orgCC-BY-SA-4.0

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