Difference between revisions of "2017 USAMO Problems/Problem 2"
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Revision as of 19:41, 20 April 2017
Problem
Let 
be a collection of 
positive integers, not necessarily distinct. For any sequence of integers 
and any permutation 
of , define an 
of 
to be a pair of entries 
with 
for which one of the following condition holds:
