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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 29 Sep 2019

      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.

      9 replies 13 retweets 55 likes
      Show this thread
    2. Michael Peyton Jones‏ @mpeytonjones 29 Sep 2019
      Replying to @propensive

      I love this puzzle!

      1 reply 0 retweets 2 likes
    3. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @mpeytonjones

      Do you know the one with the island with 50 blue-eyed and 50 brown-eyed inhabitants (±1), none of whom know their own eye colour? I think that one is a close second for me...

      1 reply 0 retweets 3 likes
    4. Michael Peyton Jones‏ @mpeytonjones 29 Sep 2019
      Replying to @propensive

      Yup, that one's also great, but I feel people know it by now, whereas this one is still new to people.

      1 reply 0 retweets 2 likes
    5. Stewart · Stewart‏ @stewSqrd 29 Sep 2019
      Replying to @mpeytonjones @propensive

      How about the one where all the prisoners yell out their hat color at the same time? (They can all see each other)

      2 replies 0 retweets 1 like
    6. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @stewSqrd @mpeytonjones

      I don't know this one...

      1 reply 0 retweets 0 likes
    7. Stewart · Stewart‏ @stewSqrd 29 Sep 2019
      Replying to @propensive @mpeytonjones

      2^n prisoners randomly assigned red/blue hats. The can see others', but not their own. Simultaneously, they yell red/blue/pass. Must have at least one correct guess, and no incorrect guesses.

      1 reply 0 retweets 0 likes
    8. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @stewSqrd @mpeytonjones

      What are they guessing?

      1 reply 0 retweets 0 likes
    9. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @propensive @stewSqrd @mpeytonjones

      Oh, I just reread the earlier tweet and it makes sense. ;)

      1 reply 0 retweets 0 likes
    10. Adam Rosien‏ @arosien 29 Sep 2019
      Replying to @propensive @stewSqrd @mpeytonjones

      there’s the one with pirates dividing a treasure on an island

      1 reply 0 retweets 2 likes
      Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @arosien @stewSqrd @mpeytonjones

      Wasn't that a movie, too?

      11:36 PM - 29 Sep 2019 from Krakow, Poland
      0 replies 0 retweets 0 likes

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