Suggestion: Limit the number of submissions for the challenge problem

Due to the nature of the challenge problem, many coders submit the same code a LOT of times
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This not only overloads the test server, but also reduces the response time for other users drastically.

Suggestions (For the long contest):

  1. Fix a limit on the total number of submissions OR

  2. Keep a minimum time between two consecutive submissions (2-5 minutes) of an user.

I personally favour the second option. What is your opinion?


Making such submission sprees has helped my code break its average, so I can’t complain if others are doing the same.

Change the Queue Priority from FIFO

  1. Let default priority be x. On a submission, that priority will be assigned to that submission and the priority of the contestant will decrease to say, x-1.
  2. The lost priority will be regained by 1, say a minute or 5.
  3. Aging for submissions with very low priority.

This will be good for people who just came in, but have queue already blocked by others.


@admin : I think allowing only one submission every 5-15 minutes for a particular problem is a good idea . That will also save CodeChef some money , because challenge problems submissions take much more time to execute than other problems and reduction in amount of submissions will mean savings for CodeChef which it can use to give more prizes , haha :slight_smile: .


I would also suggest avoiding such Challenge problems which encourages the participants to make multiple submissions for the hope of getting higher scores by chance.


@admins you should really consider extending the contest with some time because the judge is taking more than half hour for a submission - and probably close the submission for the challenge problem - :slight_smile:

I think like in codeforces, Same code should not be accepted twice.


@Balajiganapath : Everybody is doing the same thing. I even saw you :stuck_out_tongue: . And if codechef team limits submission to single per 2-5 mins as you mentioned above then nobody’s going to do challenge problem :smiley:

I think the scoring criteria should be changed. More stress should be provided on scoring criteria from next time. Scores are varying randomly in this problem. So let the people enjoy!

Codechef should provide few more hours in this contest for new users who are very last in the submission queue.


We have restricted the allowed number of submissions to 1 every 180 seconds for a user. Hopefully this is a fair restriction and can reduce the load on the server.

We are also extending the contest by 1 hour.


Or do what I suggested here:

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Making global limit for all submissions (even 10-15 seconds) is very bad for short contests.
IMHO the only thing to do is to restrict gap between submissions of challenge problems to say 30 or even 60 seconds. Then such situation will not happen again.

Actually this time due to nature of challenge problem I made 10 tabs with submit page and when I do some change in the solution I submit it 10 times (from each opened tab) to see what it is actual average score :stuck_out_tongue:

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Specially this time the challenge problem was taking a lot of time, so yes agree with you.
P.S.: similar to my desktop: Ubuntu + 1st tab facebook :smiley:

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But this is a very interesting challenge problem!!!


No doubt it is interesting, however, it has become very difficult to attempt the other problems as the feedback time for each submission is now over 30 minutes.


Well, one can always add some dummy extra lines to make it look different.

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This would at least slow down the flood of submissions of the same code. This would also help in the short contest since there were penalties in some prior short contests on codechef for multiple submissions of the same code due to server error. They can keep the hash(MD5/SHA1) of a participant’s last submission for a problem and check against that. If the last submission is within 5/15 minutes and the hash matches the last submission, the submission should not be accepted.

Codechef team seems to have responded pretty fast and introduced a cooling off period between 2 submissions. Kudos to them :slight_smile:

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It would have been of great benefit for many people, if the restrictions were applied a day before.


And you play Kollision!! :smiley:

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We have reduced the restriction to 1 submission in every 30 seconds. We will keep this as global limit.

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@admin it holds for short contest too? Typically I forget to remove public modifier from my class, that leads to compilation error. I will need to wait 30 seconds for next try now?