Japanese version is available here.
The 18th Japanese Olympiad in Informatics Final Round Online Contest is the online contest of The 18th Japanese Olympiad in Informatics Final Round. The contest is open to everybody. Everybody is welcome to attend JOI Open Contest!
The duration of the contest is 4 hours.
Registration will be open before each contest. A link to the registration page will appear on this page about 30 minutes before the beginning of the contest. Contestants can register on the contest site by themselves from the right before the beginning of each contest until the end of it.
No prizes will be given to the contestants. We will not publish the source code submitted to this contest without permission from the participants.
After the contest finishes, we will open the judging server for one week. Interested contestants can improve and resubmit their solutions by themselves.
Rules that are same as JOI 2019 Rule:
Rules that are not same as JOI 2019 Rule:
The contest is over.
Tasks and test data are available in JOI 2018/2019 本選 問題・データ(Japanese). You can get tasks from
本選 問題文, test data from
本選 サンプル入出力・採点用入力および対応する正解出力データ, sample codes from