note
runrig
Not just a golf solution, its a golf solution
generator:
<p><strong>Update:</strong> 'Borrowed' [tilly]'s list of
states. (my result is a 113 character
string - though I too am now wondering where 'KT' is ...
I'm told its a brand of whiskey, so I'll keep it in - besides,
it is now the 'official' list for this challenge :-)
<p><strong>Another update:</strong> Added [dws]'s fix.<code>
#!/usr/local/bin/perl -l -w
use strict;
my @states=qw(
AK AL AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS
KT KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM
NV NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV
WY);
my %states;
@states{@states} = ();
my @results;
my $is_done;
while (%states) {
my ($letter, $is_first);
($letter, $is_first, $is_done) = get_next_letter(\%states);
push(@results, keys %states), last if $is_done;
my $pos = $is_first ? 0 : 1;
my @states = grep { substr($_,$pos,1) eq $letter } keys %states;
my $chr_class =
'[' . join('', map { substr($_, 1-$pos, 1) } @states) . ']';
push @results, $is_first ? $letter.$chr_class : $chr_class.$letter;
delete @states{@states};
}
print '/^(',join("|", @results),')$/';
sub get_next_letter {
my $states = shift;
my (%first, %second, $is_done);
for (keys %$states) {
my ($first, $second) = split '';
$first{$first}++;
$second{$second}++;
}
my ($first) = sort { $first{$b} <=> $first{$a} } keys %first;
my ($second) = sort { $second{$b} <=> $second{$a} } keys %second;
$is_done = 1 if $first{$first} == 1 and $second{$second} == 1;
($first{$first} > $second{$second}) ?
($first, 1, $is_done) : ($second, 0, $is_done);
}
# 113 characters!
# Add 5 characters ('pop=~' to the beginning) if you want
# it to work on @_ instead of $_
/^([WLPCVGIM]A|N[CDEHJMVY]|M[DEINOST]|[VKUC]T|A[ZKLR]|[WHR]I|O[HKR]|I[LND]|[SD]C|[KW]Y|T[XN]|KS|SD|DE|FL|WV|CO)$/
</code>
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