Please Note 1: Your username must match the following regex:
Users with existing usernames that do not match the above mentioned regex need not worry. Your username will still be functional.
However, new users registering on CodeChef please make sure the username corresponds to the regex mentioned above. Usernames of any other kind would prompt an error while registering.
Please Note 2: The language C# will not be functional on CodeChef for sometime.
Our judge is facing some issues with C# submissions, so please make sure your submissions are not made in this language.
C# submissions are working now. Please report any issue to firstname.lastname@example.org