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Re^3: Selective printing of the Duplicates

by baxy77bax (Deacon)
on Jan 30, 2013 at 18:27 UTC ( #1016131=note: print w/replies, xml ) Need Help??

in reply to Re^2: Selective printing of the Duplicates
in thread Selective printing of the Duplicates

Now is it the last one or the second one. Are these duplicates or multiplicities??

So, given that these are repeated several times and you need the second one I would use :

my %seen = (); my $tmp ... $seen{$_}++; if ($_ ne $tmp && $seen{$tmp} == 1){ print $_; $tmp =$_; }elsif ($_ eq $tmp){ print $_ if $seen{$_} == 2; }
however if it is the last one then:
my %seen = (); my $tmp; my $id; ... if ($_ ne $tmp){ $seen{$tmp}=$id++; } and then in the second loop: print $_ foreach (sort{$seen{$a}<=>$seen{$b}}keys %seen);

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[erix]: Look what I found! :P
[Corion]: Hmm - actually, I don't need them, even though they'd be nice. I just want the (say) 10 latest images, and that's easily done with a limit 10 offset 0 clause, as I don't need all top 10 images for all users.
[Corion]: erix: Sure, but this is for a really-lightweight application and I'm replacing a CSV file / JSON file for user configuration with SQLite (and optionally, Pg) :)
[erix]: isn't a texty format handier for configs?
[Corion]: So far, I've avoided having even a user database by storing the user information in a (signed) cookie that the browser keeps for me, but as I want to be able to lock users, I need a second storage option :)
[Corion]: erix: It's needed for keeping the list of users and the list of tags associated with an image, and for keeping the images with users. I want an easy way to know if an image can be deleted, which means that it can't be referenced by any tag anymore. ...
[Corion]: SQL feels like a natural choice here :)

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