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Contests

ACM & OI rounds · solve against the clock
// Live & Upcoming
OI Algorithm Marathon 2026
Upcoming
📅 October 17, 2026, 5:00:00 PM → October 17, 2026, 11:00:00 PM ⏱ 6h 00m 📝 2 problems 👥 4 entrants
ACM Autumn Open 2026
Upcoming
📅 September 5, 2026, 5:00:00 PM → September 5, 2026, 10:00:00 PM ⏱ 5h 00m 📝 4 problems 👥 7 entrants
OI Contest Test #3
Upcoming
📅 January 19, 2038, 8:00:00 AM → January 19, 2038, 10:00:00 AM ⏱ 2h 00m 📝 2 problems 👥 50 entrants
ACM Contest Test #2
Live
📅 July 18, 2015, 8:00:00 AM → January 19, 2038, 11:14:07 AM ⏱ 197307h 14m 📝 2 problems 👥 2 entrants
// Past Contests
Type
Title
Window
Entrants
Problems
OI
Number Theory Night
12/6/25 · 5h
12
4
ACM
Beginners Marathon 2026
2/14/26 · 5h
14
4
OI
Weekend OI #88
6/28/26 · 23h
8
2
ACM
Summer Live Round 2026
6/26/26 · 119h
11
3
OI
DP Practice Round
9/20/25 · 5h
9
3
ACM
Newbie Cup 2025
5/10/25 · 5h
11
3
OI
Contest Test #1
2/14/18 · 23h
4
3

More Contests...