Contest
Active Contests
| Start Time | Contest Name |
|---|---|
| ◉ THIRD PROGRAMMING CONTEST 2025（AtCoder Heuristic Contest 045） |
Permanent Contests
First-time users: practice contest / Library testing: AtCoder Library Practice Contest
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Ranking: Algorithm
Important announcements
- [2025-03-20] Changes to the Rated Cap of ARC Div.1
- [2025-01-17] AHC's New Rating System
- [2025-01-15] Tentative 2025 AHC Schedule
- [2025-01-15] Announcement of AtCoder World Tour Finals 2026
- [2024-12-16] Information
- [2024-12-06] Regarding Rule Changes in ABC and ARC Due to Technological Advancement of Generative AI
- [2024-12-06] Rule Changes Regarding ARC's Division System
- [2024-12-04] Password Management for Your AtCoder Account
- [2024-12-03] Announcement Regarding ARC's Division System
- [2024-08-08] Restructuring of contests
Recent contest announcements
- [2025-04-04] New AtCoder Beginner Contest 400 Announcement
- [2025-04-04] New AtCoder Regular Contest 196 (Div. 1) Announcement
- [2025-03-29] New AtCoder Grand Contest 071 Announcement
- [2025-03-28] AtCoder Beginner Contest 399 Announcement
- [2025-03-27] THIRD PROGRAMMING CONTEST 2025（AtCoder Heuristic Contest 045） Announcement
We will hold AtCoder Beginner Contest 400.
- Contest URL: https://atcoder.jp/contests/abc400
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250405T2100&p1=248
- Duration: 100 minutes
- Writer:
mechanicalpenciI, cn449, 
chokudai, Nyaan - Tester:
sotanishy, 
toam - Rated range: ~ 1999
- The point values: 100-200-350-400-425-550-625
We are looking forward to your participation!
We will hold AtCoder Regular Contest 196 (Div. 1).
- Contest URL: https://atcoder.jp/contests/arc196
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250406T2100&p1=248
- Duration: 150 minutes
- Number of Tasks: 4
- Writer: blackyuki
- Tester: Nyaan, maspy
- Rated range: 1600 ~ 2999
The point values will be 700-700-900-900.
We are looking forward to your participation!
We will hold AtCoder Grand Contest 071. This contest counts for GP30 scores.
- Contest URL: https://atcoder.jp/contests/agc071
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250330T2100&p1=248
- Duration: 180 minutes
- Number of Tasks: 5
- Writer: chinerist
- Tester: maspy, IH19980412
- Rated range: 2000 ~
The point values will be 700-900-1100-1300-1700.
We are looking forward to your participation!
We will hold AtCoder Beginner Contest 399.
- Contest URL: https://atcoder.jp/contests/abc399
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250329T2100&p1=248
- Duration: 100 minutes
- Writer: Nyaan, yuto1115,
ynymxiaolongbao - Tester: MtSaka, sounansya
- Rated range: ~ 1999
- The point values: 100-200-350-400-500-550-675
We are looking forward to your participation!
We will hold THIRD PROGRAMMING CONTEST 2025（AtCoder Heuristic Contest 045）.
- Contest URL: https://atcoder.jp/contests/ahc045
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250328T1900&p1=248
- Duration: 10 days
- Writer:
Shun_PI - Rated range: All (Heuristic Rating)
This contest is one of the qualifying contests for AWTF 2026.
We are looking forward to your participation!