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Feb 20 at 15:08 history edited wjmccann CC BY-SA 4.0
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Feb 20 at 13:32 history edited RobPratt CC BY-SA 4.0
added 3 characters in body
Feb 20 at 8:21 history edited YCor CC BY-SA 4.0
removed capitals from title
Feb 20 at 8:01 comment added YCor @CommandMaster Player 2 knows the number of matches, not the indices
Feb 20 at 2:47 comment added Daniel Weber If he gets the number then see, for example, the paper Playing Mastermind with Many Colors which shows an upper bound of $O(n\log\log n)$, and as far as I know it's the best known
Feb 20 at 2:43 comment added Daniel Weber Wait, does he get the number of matches or the indices?
Feb 20 at 2:32 comment added Daniel Weber You can do $n+1$ guesses by $1,2,...,n$, then $2,3,...,n,1$, and so on, and then you will know all values.
Feb 20 at 2:25 history edited RobPratt CC BY-SA 4.0
edited body; edited tags
Feb 19 at 20:33 history asked wjmccann CC BY-SA 4.0