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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};

In reply to Re: Loosing Negative Values in Array Ref by Thelonius
in thread Loosing Negative Values in Array Ref by Anonymous Monk

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