Hello Everyone!

Japanese Olympiad in Informatics Spring Camp 2021 will be held from Mar. 20 to Mar. 23.

There will be four online mirror contests during the camp.

• day1 : Mar. 20, 02:00 — Mar. 21, 00:00 GMT
• day2 : Mar. 21, 02:00 — Mar. 22, 00:00 GMT
• day3 : Mar. 22, 02:00 — Mar. 23, 00:00 GMT
• day4 : Mar. 23, 02:00 — Mar. 24, 00:00 GMT

The duration of the contest is 5 hours. You can choose start time from specified range freely. Please note that if you start competing after 19:00 GMT, competition ends at 00:00 GMT and duration is less than 5 hours.

There are 3 or 4 problems in each day. Problem statements will be provided both in Japanese and English. There might be unusual tasks such as output-only tasks, optimization tasks, reactive tasks and communication tasks, just like International Olympiad in Informatics (IOI).

The contest site and registration form will be announced about 30 minutes before the contest.

Details are available in the contest information page.

We welcome all participants. Good luck and have fun!

UPD : We made the time windows longer.

Hello Everyone!

The 20th Japanese Olympiad in Informatics Final Round Online Contest will be held on February 14. (08:00-12:00 GMT).

The contest duration is 4 hours. There are five problems, which are the same as the 20th JOI Final Round. Problem statements will be provided both in Japanese and English.

The registration page will be announced 30 minutes before the contest start.

You can see details in the contest information page.

Hello everyone!

JOI Open Contest 2020 will be held from Sunday, September 6, 04:00 UTC to Monday, September 7, 04:00 UTC. You can start at any time and the duration is basically 5 hours. Note that the duration becomes shorter if you start after Sunday, September 6, 23:00 UTC, i.e. less than 5 hours before the contest ends.

There will be 3 tasks. Each submitted source program must be written only in C++. Problem statements will be provided both in Japanese and in English. You can find more details in the contest page.

Past contests are also available in this page. Since the judge server isn't available now, please download testcases when you want to test your code.

Good luck and have fun!

Hello Everyone!

Japanese Olympiad in Informatics Spring Camp 2020 will be held from Mar. 19 to Mar. 23.

There will be four online mirror contests during the camp.

• day1 : Mar. 20 (01:00 — 06:00 GMT) or Mar. 20 (07:30 — 12:30 GMT)
• day2 : Mar. 21 (01:00 — 06:00 GMT) or Mar. 21 (07:30 — 12:30 GMT)
• day3 : Mar. 22 (01:00 — 06:00 GMT) or Mar. 22 (07:30 — 12:30 GMT)
• day4 : Mar. 23 (01:00 — 06:00 GMT) or Mar. 23 (07:30 — 12:30 GMT)

The contest duration is 5 hours and there are 3 or 4 problems in each day. Problem statements will be provided both in Japanese and English.

There might be unusual tasks such as output-only tasks, optimization tasks, reactive tasks and communication tasks, just like International Olympiad in Informatics (IOI).

The contest site and registration form will be announced about 30 minutes before the contest.

Details are available in the contest information page.

We welcome all participants. Good luck and have fun!

UPD: The timezone of the latter mirror contest is modified.

UPD2: The timezone of the latter mirror contest is again modified.

UPD3: Now, you can play mirror contests during any contiguous 5 hours until 12:30 GMT.

Hello Everyone!

The 19th Japanese Olympiad in Informatics Final Round Online Contest will be held on February 9. (01:00 — 05:00 GMT).

The contest duration is 4 hours. There are five problems, which are the same as the 19th JOI Final Round. Problem statements will be provided both in Japanese and English.

The registration page will be announced 30 minutes before the contest start.

You can see details in the contest information page.

Hello everyone!

JOI Open Contest 2019 will be held on July 14. (04:00-09:00 UTC) and July 14. (10:00-15:00 UTC). As the tasks in these rounds are the same, you can participate in whichever round you like.

The contest duration is 5 hours and there will be 3 tasks. Each submitted source program must be written only in C++. Problem statements will be provided both in Japanese and in English.

You can find the details in the contest page.

The past contests are also available in this page. Since the judge server isn't available after the contests, please download the testcases when you want to test your code.

Good luck and have fun!

UPD : The third round will be held from 15:30 UTC.

UPD2 : Reviews, sample sources and test data are uploaded to the contest page.

Hello Everyone!

Japanese Olympiad in Informatics Spring Camp 2019 will be held from Mar. 19 to Mar. 25.

There will be four online mirror contests during the camp.

• day1 : Mar. 20 (01:30 — 06:30 GMT)
• day2 : Mar. 21 (01:30 — 06:30 GMT)
• day3 : Mar. 22 (01:30 — 06:30 GMT)
• day4 : Mar. 23 (01:30 — 06:30 GMT)

The contest duration is 5 hours and there are 3 or 4 problems in each day. Problem statements will be provided both in Japanese and English.

There might be unusual tasks such as output-only tasks, optimization tasks, reactive tasks and communication tasks, just like International Olympiad in Informatics (IOI).

The contest site and registration form will be announced about 30 minutes before the contest.

Details are available in the contest information page.

We welcome all participants. Good luck and have fun!

UPD: The link to the contest page is added. Schedule is updated.