use YAML;
my ( @one, @two );
my %one_two = map {; $_ => int(rand(2) } 1 .. 10;

for my $key ( keys %one_two )
{
    push @one, $key;
    push @two, $one_two{$key} || undef; # "skips" 0s here.
}

print Dump ( \%one_two, \@one, \@two );