I love CarTalk. Here's my solution:
use strict; use warnings;
my %lights = map { $_ => 1 } ( 1..20_000 );
foreach my $flipper ( 2..20_000) {
for( my $i = $flipper; $i <= 20_000; $i += $flipper ){
$lights{ $i } = !$lights{ $i };
}
}
# print 'em
print join(', ', grep { defined $_ }
map { $lights{ $_ } ? $_ : undef }
( 1..20_000)
)."\n";
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