My emails do not match. What do I do?

First of all, thanks for organizing the challenge! It can be seen that a lot of thought and effort was put into creating the problems. At the same time, I must say that some technical details around the format (rules, test cases, feedback) were not thought through well enough. There are some comments (1 2 3 4) from high scoring participants suggesting the same. I believe these comments have already been noticed. Still, I will suggest some ideas that could improve the situation for the upcoming editions of ICPC Challenge.

If the test cases are fixed during the contest and detailed enough feedback is provided for each submission (which was the case for Problem 2 this year), then make it clear that over-fitting for these particular test cases is allowed and expected. The most direct way would be to provide the test number in the input. The only other option, in my opinion, is minimal feedback (perhaps only the total score, without time and memory information) and strict limit for the number (or frequency) of submissions.

If the final test cases are going to be different from the preliminary ones (as for Problem 1 this year), then execute the submissions on all test cases (i.e. both preliminary and final) during the contest and provide the participant with a single bit of information about the final test cases ― whether the solution succeeded on all of them (i.e. there are no TLE, RE, etc). Obviously, even this single bit of information can be abused, so perhaps a strict limit for the number (or frequency) of submissions is necessary in this case as well.

Some kind of token system might be better than a constant limit for the number or frequency of submissions. For example, a participant starts with $$$N$$$ tokens and receives an additional token every $$$T$$$ hours. One token should be spent to submit a solution, or, alternatively, to request some additional feedback about the submission.

PS The main purpose of this comment is to bring attention to some issues of this year's edition and to show that some improvements are possible. Surely, the specific examples above are not the only options and I am sure that it is possible to come up with an approach that will improve the situation from both organizers and participants points of view.

PPS Please excuse me for such a negative looking comment. I did enjoy the problems, so thanks again for organizing the challenge and thanks for the great problems!

Has anyone received the prize collection instructions yet?

Hello organizers, about when we get information about prize delivery.. It seems to me that it is not started yet.. or am I missed something..