Re: how to speed up dupe checking of arrays

[wind]

Most likely you're going to simply be throttled by IO speed. However, your above code could in theory be simplified by limiting the split to only 3 parts, and by adding the dup check to the while loop. Assuming that dup count is all you really care about.

if ($file =~ $spec_text){
    my $file_date = (split(/\./,$file))[3];
    open(IN, '<', $file) or die("open failed: $!");
    my $count_uniq = 0;
    my %seen;
    while (<IN>) {
        chomp;
        my ($ele0, $ele1, undef) = split ';', $_, 3;
        $count_uniq++ if !$seen{"$ele0;$ele1;$file_date"}++;
    }
    print "$.\n"; # Total number of lines.
    print "$count_uniq\n";
    close(IN);
}

- Miller