GeneralSolvesv1

One question defeats a liar and a truth-teller

Asking either guard to report the other’s answer forces the same false direction.

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Output
Choose the opposite door to find the safe route
Input
Two guarded doors, one safe, with one guard always truthful and one always lying
Relationship

What connects the input and output?

Ask either guard which door the other guard would identify as safe. The truthful guard reports the liar’s wrong choice; the liar lies about the truthful guard’s correct choice.

Sources

1
  1. en.wikipedia.org: One question defeats a liar and a truth-telleren.wikipedia.orgCC-BY-SA-4.0

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