Separate final test cases for Challenge Question.

@admin , @everyone : I believe final test cases for Challenge Question should be different from those used during the contest . The practice of making hundred's and thousand's of submission's to understand test cases at server is becoming very prevalent and is not in the interest of "MAY THE BEST SUBMISSION WIN" .
I sincerely hope Code Chef admin's will look into this .
Once the question is moved to practice section you can keep both set of test cases or discard any one , as it doesn't matter if you do over-fitting once the contest is ended .
Things like money , rating , bragging rights are at stake :)
I think it is not in interest of CodeChef anyway if people are making thousand's of submission to learn test data since each submission gets run on SPOJ which costs money to Code Chef .
I don't think contestants who resorted to such strategy can be blamed because currently Code Chef admin's have neither raised this issue , nor took preventive action .