There are 100 prisoners, numbered 1-100. The prisoners' numbers are written onto 100 cards, put randomly into 100 envelopes numbered 1-100. They can't communicate, but are invited, one by one, to open 50 envelopes. If any prisoner fails to find his number, they all get killed.
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Replying to @propensive
This took longer than I'd like. Open the drawer w/your own matching number. If the number doesn't match, open the drawer for that number. Repeat. Now we're hoping that none of the prisoners are in a cycle of length > 50, but at least there can be only one such cycle.
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Replying to @kmett
The condition that everyone dies if anyone loses basically means there must not be a cycle of size larger than fifty. But I'm impressed!
9:07 AM - 29 Sep 2019
from Krakow, Poland
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