Posted on Dec. 15, 2025, 2:26 p.m.
The next MarisaOJ contest — Round #3 "MariVOI 2026" — will take place on Saturday, December 20, 2025 at 20:00 (GMT+7)!
Time: 20:00 +07 | 20/12/2025 — 3.0 hours
Rules (National OI-style format):
Access the contest here.
Join our Discord server here to receive the earliest announcements!
Posted on Oct. 27, 2025, 12:53 p.m.
The next MarisaOJ Contest will take place on Friday, 31/10/2025 at 20:00 GMT+7!
The round consists of 5 to 6 problems in OI format, and you've got 3 hours to solve them all.
Join the Discord server here to get notified faster!
Posted on April 7, 2025, 4:06 a.m.
The next MarisaOJ Contest will take place on Monday, 07/04/2025 at 20:00 GMT+7!
The round consists of 6 problems in ICPC format, and you've got 2 hours and 30 minutes to solve them all.
Join for fumo ᗜˬᗜ
Join the Discord server here to get notified faster!
Posted on Jan. 20, 2025, 3:18 a.m.
Posted on Jan. 17, 2025, 4:50 p.m.
The next MarisaOJ will take place on Saturday, 18/01/2025 at 20:00 GMT+7!
The contest format is OI (Olympiad in Informatics), and you will earn points for each test case answered correctly.
The problem set consists of 5 problems, ranging from easy to moderately difficult.
Join now for a chance to win a MarisaOJ T-shirt:
Join the Discord server here to get notified faster!
Posted on Dec. 23, 2024, 2:21 a.m.
First of all, we would like to apologize to everyone for the system instability during the competition. This issue will be resolved in future competitions!
Posted on Dec. 18, 2024, 11:52 a.m.
The first official contest of MarisaOJ will take place on Saturday, 21/12/2024 at 20:00 GMT+7!
The contest format is OI (Olympiad in Informatics), and you will earn points for each test case answered correctly.
The problem set consists of 6 problems, ranging from easy to moderately difficult.
Join now for a chance to win exciting prizes:
Join the Discord server here for more information about the prizes.
Posted on May 21, 2024, 8:23 a.m.
On the occasion of MarisaOJ reaching the milestone of 1e5 submissions, a small giveaway event is being held on MarisaOJ's Discord server: https://discord.com/invite/jRJAdqzjDT.
The prizes for this event are two Marisa fumos (bootleg):
Please join the Discord server to view the event rules. The event lasts for one week, so don't miss out!
Posted on Jan. 2, 2024, 12:09 p.m.
Posted on Sept. 19, 2023, 5:04 p.m.
To prevent valid solutions from receiving a Time Limit Exceeded (TLE) verdict in Python, the submission time limits for Python have been extended to five times their original values. For instance, if the specified time limit is 1000 milliseconds (ms), when you submit code in Python, the effective time limit will be 5000 ms. Furthermore, all previous Python submissions that received a TLE verdict have been rejudged with the updated time limit. This adjustment aims to ensure fair assessment and accuracy in evaluating Python solutions.
