Internet Problem Solving Contest

IPSC 2018 Announcements

2018-10-06 21:41:00 UTC
If you missed the contest or couldn't solve a problem in time, all problems are now available in the Training Area. Enjoy!
2018-10-06 21:36:00 UTC
All outputs, our implementations of reference solutions and other materials from the contest are now available in the IPSC Archive.
2018-10-06 20:10:00 UTC
A preliminary version of the booklet with solutions is now available. (Some of the solutions will later be written in a more detailed way.) Enjoy!
2018-10-06 20:00:00 UTC
And just like that, the contest is over!

Congratulations to ♪ ♪ ♪ (shik, step5, peter50216) for their amazing performance.

Regardless of whether you won the whole thing or proudly solved one problem, we hope you had fun and we already look forward to seeing you back next year!

Don't forget to take the IPSC Schedule Survey and help us pick the best time of day for the contest next year.

A preliminary version of the booklet with solutions will be available in a few minutes. Our implementations, correct outputs and other materials will then be uploaded within the next 24 hours.
2018-10-06 18:55:00 UTC
Problem K: Accidentally, the grader did not accept submissions that used "+0" (only those that used "-0") in the absolute term of the polynomial. This was fixed and the problem was rejudged, with several changes from WA to OK. Additionally, one team now has a more helpful WA message telling them that their submission was not a 7-bit ASCII text file. Sorry about the issue.
2018-10-06 17:18:00 UTC
We are aware that there is no completely fair solution to the issues some teams had with problem M due to the fact that the site was not responsive during some minutes. We apologize for the trouble this may have caused you, and we hope that the issues won't come back.

The best solution we came up with is the following one:
  • If your restaurant is running, we will reset your reputation to 10 as a one-time change.
  • If you already have humans, we will remove them as a one-time change.
  • If your restaurant is closed but you reopen it before 17:30 UTC, the previous two items will apply to it as well.
2018-10-06 16:59:00 UTC
In particular, we are aware that this impacts solvability of problem M. This is something we will address if and when the issue is resolved. (There is no need to send us messages detailing how your team was affected.)
2018-10-06 16:43:00 UTC
We are aware of issues with the responsiveness of the webserver, and we are trying to deal with them. Please be patient.
2018-10-06 16:40:00 UTC
Problem L: Please note that (as stated in the statement) in the file you submit you have to print at least one empty line between consecutive games. If the empty lines are missing, our grader will parse the entire submission as a single game.
2018-10-06 16:10:00 UTC
Problem E: Corrections were made in the example annotation:
In sample 1, correct set of good values is {1, 5 6, 10, 12}.
In sample 4, the correct number is 142816 142817.
A corrected version of the statement will be uploaded in a minute.
2018-10-06 15:32:00 UTC
Problem G: There was a typo in the statement. The correct example checksum is 649, not 646. A corrected version of the statement will be uploaded in a minute.
2018-10-06 14:20:00 UTC
For clarification requests during the contest, talk to us live at ipscinfo2018@gmail.com, send an e-mail to ipscinfo2018@gmail.com, or send an e-mail to ipscreg@ksp.sk. (All these ways of communication will reach the same destination.)