Time of the contest: 2nd April, 2017, Sunday CEST 10:00-20:00
If you have any questions or problems, talk to us on IRC: irc.ch24.org challenge24
IMPORTANT! Due to unforeseen difficulties, this years contests deadlines changed.The new dates are:
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To upload a solution, youll have to register a team.
Download the problem set BEFORE the contest.
Time of the contest: 24th June, 2017, Saturday CEST 12:00-18:00
Electronic Contest: July 1st, 2017, 10:00 – 14:00 CEST (Saturday)
(soon)Finals:June 29th – July 2nd, 2017, Thursday to Sunday–>
3 epiphallar_caecum 79902016-06-23Registration papers in 2016:
August 31st – September 3rd, 2017 (from Thursday to Sunday)
Hardware registration form (DOCX)2016-04-06
Registration Deadline: June 29th, 2017, 20:00 CEST (Thursday )
Challenge24 – International 24-hour Programming Contest
Official in 2017:Challenge24 Hungarian Cupfor the best Hungarian teams (International Finalist and maximum ten more Hungarian teams)
Download and share your favourite poster!
To upload a solution, youll have to register a team.
The submission for the EC is extended until 18:30 CEST. Due to problems with the evaluation framework, your team can submit only one valid solution per task per test case (the lates submitted solution will be evaluated after the submission closes). Thus you wont get feedback until we evaluate your teams solutions which is after the submission ends. If there is any problem with submitting your solutions, send us a mail to with your solutions and team name. We will evaluate those which were sent before 18:30CEST.
The results of the EC submissions are available here:
July 1st, 2017, 10:00 – 14:00 CEST (Saturday)Final application and invitation letter request:May 10th, 2017, Tuesday CEST 24:00–>
The Pre-EC is 6 hours long to accommodate various timezones and schedules, but it doesnt typically require more than a couple of hours to solve the tasks.
The extended registration has started!
Finals: August 31st – September 3rd, 2017 (from Thursday to Sunday)
June 29th, 2017, 20:00 CEST (Thursday )Pre-EC:April 2nd, 2017, Sunday CEST 10:00-20:00Electronic Contest:April 15th, 2017, Saturday CEST 10:00-14:00 (not 15:00!)–>
As in previous years, there will be a demo round before the EC, called the Pre-EC. This gives you the opportunity to test our submission interface and the evaluation process, and lets us check our infrastructure. You can also use the Pre-ECs problems to practice handling the file formats you may have to deal with during the EC. We think its highly advisable to try the Pre-EC.
If you have any questions or problems, talk to us on IRC: challenge24
PROBLEMSET – only PDF2016-06-26Congratulation Team Dandelion and Sparrows!
The Pre-EC is 10 hours long to accommodate various timezones and schedules, but it doesnt typically require more than a couple of hours to solve the tasks.
We apologise for the inconvenience and hope to see you in the competition!
Important dates:Registration Deadline:April 13th, 2017, Thursday CEST 20:00–>
Download the problem set BEFORE the contest.
As in previous years, there will be a demo round before the EC, called the Pre-EC. This gives you the opportunity to test our submission interface and the evaluation process, and lets us check our infrastructure. You can also use the Pre-ECs problems to practice handling the file formats you may have to deal with during the EC. We think its highly advisable to try the Pre-EC.
Challenge24, is one of the few team contests where participants arefree to choose their tools, platforms and programming languages,and problems are presented only using open file formats.