Improvement in Long Contest

There might be few things that can be done in Long Contest Challenge Problem.

1. Successful submission accuracy for challenge problems can be limited to first time successful submission, by the user.

2. Also, the number of submissions for the challenge problem can be limited to 500 or something like that per user.

3. And Some information about the input test case generation is to be given. Since, many users keeps on doing hit and trail to know the input format.

4. And need better tutorials for the challenge problem. Since, what top coders apply is far more stronger algorithm as compared to tutorials. And I personally, want topcoders to explain their approach especially, for the challenge problem.