That can be solved in linear time with an auxiliary array. 
sub comp {
 my ($a, $b) = @_;
 return 0 if @$a != @$b;
 my @c;
 ++$c[$_] for @$a;
 --$c[$_] for @$b;
 $_ != 0 && return 0 for grep defined, @c;
 return 1;
}

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In reply to Re: Compare two arrays of simple numbers by Prof Vince
in thread Compare two arrays of simple numbers by punch_card_don

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