You could always just sort it and then take the highest one. I'm not sure how that compares speed wise with just scanning threw 1 by 1. Of course you could just keep a $counter and increment it when adding and not decrement it when removing. Then there is no need to find the highest because you remember it.
my $highest;
for (@array) { # or keys %hash
$highest = $_ if $_ > $highest;
}
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