Nice idea.
A few minor nits though. First is that it is customary to
only count the body of the sub, so you actually did slightly
better than you thought! A second minor issue is that your
grep is not quite right - the string "fooey\n" will match
/^fooey$/ so you don't really have an equality test.
Further than that, there are some mechanical tricks that can
be used to improve scores. Such as using an inline for
loop, using map to avoid double loops, and the like.
Using those I can take your answer to 75 fairly easily:
sub f{
#23456789_123456789_123456789_123456789_123456789_123456789_123456789_
+12345
%h=@_;$h{$_}||=[]for map@$_,values%h;sort{-1+2*grep$_ eq$b,@{$h{$a}}}k
+eys%h
}
UPDATE
Oops. I didn't notice the lack of transitivity in your
code. This is a fatal flaw as you see with the following
data set.
my @list = (
a => ['b'],
b => ['c'],
c => ['d'],
d => ['e'],
);
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