JOI Open Contest 2018

This is an IOI-like open competition for students at schools for secondary education. The main purpose of this contest is to give an opportunity to Japanese delegations and candidates of delegations for training and practice. But the contest itself is open to everybody. Everybody is welcome to attend JOI Open Contest 2018!

The duration of the contest is 5 hours. The same contests are held twice (Round 1 and Round 2). Contestants can participate in one of Round 1 or Round 2 according to their time zone. After Round 2 finishes, we will open the judging server for one day. Interested contestants can improve and resubmit their solutions by themselves.

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 each 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.

Contest Information

Name: JOI Open Contest 2018
Contest System: CMS
Contest duration: 5 hours
The number of tasks: 4 tasks
Language: English, Japanese
Round 1: Sunday, July 8, 2018; ~~13:00-18:00~~ 13:15-18:15 +0900 (JST); ~~04:00-09:00~~ 04:15-09:15(UTC/GMT)
Round 2 (tasks for Round 1 and Round 2 are the same): Sunday, July 8, 2018; 19:00-24:00 +0900 (JST); 10:00-15:00 (UTC/GMT)

Rule

Rules that are same as IOI 2017 Rule:

Each submitted source program must be written in either C++ (C++14), Pascal, or Java. Allowed extensions for source codes are:
- C++: .cpp
- Pascal: .pas
- Java: .java
There are no release tokens.
All submissions will receive full feedback.
Contestants may submit at most once per task per minute.
Contestants may submit at most 50 times per task.

Rules that are not same as IOI 2017 Rule:

There are no testing environments. To test a solution you can simply make a full submission.
Question form is available on a contest server, but no replies are guaranteed.

Contet Site

The contest is over.

Ranking

Problem Statements

Implementation Notice en / ja
bubblesort2 en / ja
catdog en / ja
collapse en / ja
xylophone en / ja

Reviews

bubblesort2 en / ja
catdog en / ja
collapse en / ja
xylophone en / ja

Sample Sources

bubblesort2 cpp / java / pascal
catdog cpp / java / pascal
collapse cpp / java / pascal
xylophone cpp / java / pascal

Test Data

bubblesort2 data / dist / judge_files
catdog data / dist / judge_files
collapse data / dist / judge_files
xylophone data / dist / judge_files

Problem inventors

bubblesort2 was proposed by Riku Kawasaki.
catdog was proposed by Yuta Takaya.
collapse was proposed by Satoru Kawaharai.
xylophone was proposed by Yuta Takaya.

Questionnaire

Please answer the questionnaire. We appreciate your feedback on our contest!

JOI Open Contest 2018 Survey

Contact

joiopen at googlegroups.com

License

The tasks for JOI Open Contest 2018 by JCIOI (the Japanese Committee for the IOI) is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. If you need a license other than a Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0), please ask JCIOI.