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Re:Gaming CS Interviews by lucas_ on Wednesday September 28, 2022 @01:05PM (#33010360)
I remember this version of the riddle:

- 1 light bulb and 3 switches outside. Determine which switch powers the bulb while only entering the room once.

Re:Gaming CS Interviews by Izkata on Wednesday September 28, 2022 @01:26PM (#33010622)
There's also one with 3 switches and 3 bulbs; the solution is the same except you leave the third one on.