# The snippet below returns Score = 4 for (GG,GG)-case
sub score 
{
  my ($str,$array) = @_;
  my %position_score;
  my $offset = 0;
  
  for my $frag (@{$array}) {
      #my $idx = index($str, $frag) + 1;
      my $idx = index($str, $frag, $offset) + 1;
      
      for my $pos ($idx .. $idx + (length($frag) - 1)) {
             $position_score{$pos} = 1;
      };
      $offset = $idx;
  };