Hi,

How about something like this, using a hash instead of an array for @data...

my %data_hash;

foreach $elem (@data) {
    my ($sub, $max) = split /\|/, $elem;
    $data_hash{$sub} = $max;
}

foreach $r (@ref) {
    my ($id, $time) =      split /\|/, $r;
    my ($key, $instance) = split /:/, $id;
    if ($data_hash{$key} ne $time) {
        push @set, join (':', $key, $instance);
    }
}

[download]
This assumes that there are no duplicate $sub values in the data file. Since you refer to them as identifiers, I'm assuming they are unique identifiers. Anyway, I didn't run any benchmarks (or even test this code), but this approach should speed things up a bit.

-Bird

Oh, this will also print any id's in @ref that don't show up in @data at all. You can tweak that if you'd like though, just modify the conditional a bit.

In reply to Re: Large Set Efficiency Question by Bird
in thread Large Set Efficiency Question by insensate

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