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Apply TodayWrite a function that has the following property: f(f(x)) = -x for any numeric array x.

Note that there is no restriction on the output for f(x). How bizarre can you make it?

55 correct solutions
54 incorrect solutions

Last solution submitted on Apr 29, 2016

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1 Comment

Andrew Newell
on 15 Aug 2013

Getting a little silly!

1 Comment