You have $tmp->[$i] = '0' unless defined $tmp->[$i];
...
$tmp->[$i] = $aref->[$i] if $aref->[$i] gt $tmp->[$i];
Since a "-" is lt "0", you're never going to be seeing negative numbers.
To get the array in alphabetical order, use sort. You could sort it after you create it, or you can create it in alphabetical order by changing for my $aref_acc_num (values %$acc_num) {
to for my $aref_acc_key (sort keys %$acc_num) {
my $aref_acc_num = $acc_num->{$aref_acc_key};
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