I had to take a shower to wash off the filth after filling out their questionnaire just to submit a solution.

They have my name as "me here"; workplace as 'not there'; my addy as 'Ahouse' in 'Acity' postcode '90210'; amongst other dross :)

I expect to get junk mail even though I specifically opted out of their mailing list.

The beauty of time-limited, disposable email IDs.

It could be that I opted to produce all output after all input had been taken.

Nope. This still fails with wrong output:

#! perl -w
use strict;

my @scores;
for( 1 .. <> ) {
    my %h;
    for( 1 .. <> ) {
        $h{ $_->[0] } = $_->[1] for [ split ' ', <> ];
    }
    my $score = 0;
    /\+/ and ++$score or --$score for values %h;
    push @scores, $score;
}
print "$_\n" for @scores;
[download]