|  | The Caterer's Problem | 
 You are organizing a conference in social choice theory, with a festive dinner
on thefirst day. The catering service has 1024 different dinner choices they
know how to make, out of which you need to choose 10 to be in the dinner
menu (each participant will choose one of these during the dinner). You send
an email to the 6875 participants of the conference, with the list of all 1024
choices, asking them to rank the choices in linear order from their favorite to
their unfavorite.
You are organizing a conference in social choice theory, with a festive dinner
on thefirst day. The catering service has 1024 different dinner choices they
know how to make, out of which you need to choose 10 to be in the dinner
menu (each participant will choose one of these during the dinner). You send
an email to the 6875 participants of the conference, with the list of all 1024
choices, asking them to rank the choices in linear order from their favorite to
their unfavorite.
You want to find a list L of 10 choices, such that for any dinner choice d not in the list L, if we run a vote of d against L, at least half of people will favor one of the choices in L over d (it may be different dish for different people).
Is it always possible to produce such a list?
 alanATrandomDOTmathDOTcmuDOTedu
 alanATrandomDOTmathDOTcmuDOTedu |  | Previous Puzzles and Solutions | 
  
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