Hello everyone!

JOI Open Contest 2017 will be held on July 2. (04:00-09:00 GMT) and July 2. (10:00-15:00 GMT) .The tasks for Round 1 and Round 2 are the same. So you can choose the round you will participate in.

The main purpose of this contest is to give an opportunity to Japanese delegations and candidates of delegations for training and practice for IOI. But the contest itself is open to everybody. Everybody is welcome to attend JOI Open Contest 2017!

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

Details are available in contest information .

The past contest information is available in JOI Website .

Good luck and have fun!

UPD: The round1 will start in 90 minutes. The contest site and registration form will be announced 30 minutes before the contest.

UPD2: The contest is over. Thank you for your participation! Now, you can get problem statements, editorials and test data from contest information . Also, we open judge for analysis for about 24 hours from now. contest page is here .

We are carrying out the questionnaire to improve our contests. Please tell me your impressions about the contest. You can access the questionnaire sheet here . Thank you for your cooperation.

UPD3: The judge program for amusement_park was wrong in the contest as mentioned in this blog comment. Now, you can use the correct judge in the analysis round. We extend the analysis round 24 hours (The end of the round is 7/5 01:00 GMT) . You can also get the correct judge program from the test data section. We are very sorry for this issue.