<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine on
RewriteBase /subdirectory/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?$1 [L]
</IfModule>

$config['base_url'] = '';
$config['index_page'] = '';
$config['uri_protocol'] = 'AUTO';

$route['default_controller'] = "login";
$route['404_override'] = '';