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Need help about path

My CI project
The path is CI/
When URL /show/1
The path is CI/show
but I want it still CI/

$route['default_controller'] = 'welcome';
$route['wish/(:num)'] = 'welcome/wish/$1';

class Welcome extends CI_Controller {
public function index()
public function show($a){
$data['title'] = 'help';
$data['id'] = $a;

Please, put your code inside code blocks and indent it properly, like this:
PHP Code:
public function index()

It's not clear what you want. If you let your users access a URL CI/1, how would your application know which controller/method to call?
I'm not sure whether this route will work:
PHP Code:
$route[':num'] = 'welcome/show/$1'
You can also use regular expressions in routes, for more flexibilty.

Remember that routes are always relative to the base_url.
How is your base_url() set in application/config/config.php?

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