We will hold AtCoder Regular Contest 208 (Div. 2).

• Contest URL: https://atcoder.jp/contests/arc208
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251012T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 5
• Writer: sounansya
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2399

The point values will be 500-600-700-700-1100.

We are looking forward to your participation!

We will hold Panasonic Programming Contest 2025（AtCoder Beginner Contest 427）.

• Contest URL: https://atcoder.jp/contests/abc427
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251011T2100&p1=248
• Duration: 100 minutes
• Writer: MMNMM, cn449, evima
• Tester: toam, kyopro_friends
• Rated range: ~ 1999
• The point values: 100-200-350-425-500-525-625

We are looking forward to your participation!

We will hold AtCoder Regular Contest 207 (Div.1).

• Contest URL: https://atcoder.jp/contests/arc207
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251005T2100&p1=248
• Duration: 150 minutes
• Number of Tasks: 5
• Writer: camypaper
• Tester: maroonrk, snuke
• Rated range: 1600 ~ 2999

The point values will be 800-800-800-800-800.

Please note that the rules against generative AI were updated on October 3, 2025. Please make sure to read this post and the rules.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 426.

• Contest URL: https://atcoder.jp/contests/abc426
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251004T2100&p1=248
• Duration: 100 minutes
• Writer: physics0523, yuto1115, evima
• Tester: sheyasutaka, math957963
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-575

Starting with this contest, the rules against generative AI have undergone significant changes. Please make sure to review this post and the rules.

We are looking forward to your participation!

We will hold UNIQUE VISION Programming Contest 2024 Autumn (AtCoder Beginner Contest 425).

• Contest URL: https://atcoder.jp/contests/abc425
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250927T2100&p1=248
• Duration: 100 minutes
• Writer: sounansya, toam
• Tester: cn449, MMNMM
• Rated range: ~ 1999
• The point values: 100-200-350-425-450-500-575

We are looking forward to your participation!

We will hold AtCoder Regular Contest 206 (Div. 2).

• Contest URL: https://atcoder.jp/contests/arc206
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250921T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 5
• Writer: nok0
• Tester: physics0523, maspy
• Rated range: 1200 ~ 2399

The point values will be 400-500-600-700-800.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 424.

• Contest URL: https://atcoder.jp/contests/abc424
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250920T2100&p1=248
• Duration: 100 minutes
• Writer: math957963, kyopro_friends, evima
• Tester: sounansya, yuto1115
• Rated range: ~ 1999
• The point values: 100-200-300-425-475-525-625

We are looking forward to your participation!

We will hold ALGO ARTIS Programming Contest 2025 Summer（AtCoder Heuristic Contest 054）.

• Contest URL: https://atcoder.jp/contests/ahc054
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250919T1900&p1=248
• Duration: 10 days
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

AtCoder Heuristic Contest (AHC) is a series of programming contests held regularly on AtCoder. Unlike algorithm contests such as ABC/ARC/AGC, the goal is to create a better solution to a problem for which it is difficult to find the optimal solution.

This contest is one of the qualifying contests for AtCoder World Tour Finals 2026 to crown the world champion of AtCoder players. Please refer to this post for more details.

After the contest ends, all participants can post their approach on the Editorial tab. Please share your approach.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 423.

• Contest URL: https://atcoder.jp/contests/abc423
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250914T2100&p1=248
• Duration: 100 minutes
• Writer: cn449, sheyasutaka
• Tester: physics0523, Nyaan
• Rated range: ~ 1999
• The point values: 150-200-300-400-475-525-600

We are looking forward to your participation!

We will hold 12th Asprova Programming Contest（AtCoder Heuristic Contest 053）.

• Contest URL: https://atcoder.jp/contests/ahc053
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250913T1900&p1=248
• Duration: 4 hours
• Writer: iaNTU, kozima, niuez
• Rated range: All (Heuristic Rating)

AtCoder Heuristic Contest (AHC) is a series of programming contests held regularly on AtCoder. Unlike algorithm contests such as ABC/ARC/AGC, the goal is to create a better solution to a problem for which it is difficult to find the optimal solution.

This contest is one of the qualifying contests for AtCoder World Tour Finals 2026 to crown the world champion of AtCoder players. Please refer to this post for more details.

After the contest ends, all participants can post their approach on the Editorial tab. Please share your approach.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 422.

• Contest URL: https://atcoder.jp/contests/abc422
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250907T1310&p1=248
• Duration: 100 minutes
• Writer: MMNMM, Nyaan, kyopro_friends, sheyasutaka
• Tester: toam, kyopro_friends
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-500-575

We are looking forward to your participation!

We will hold AtCoder Regular Contest 205 (Div. 2).

• Contest URL: https://atcoder.jp/contests/arc205
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250906T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 5
• Writer: (proposal) snuke, (prepare) sounansya
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2399

The point values will be 400-500-600-600-700.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 421.

• Contest URL: https://atcoder.jp/contests/abc421
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250830T2100&p1=248
• Duration: 100 minutes
• Writer: kyopro_friends, yuto1115, sheyasutaka
• Tester: math957963, cn449
• Rated range: ~ 1999
• The point values: 100-200-350-425-475-525-600

We are looking forward to your participation!

We will hold AtCoder Heuristic Contest 052.

• Contest URL: https://atcoder.jp/contests/ahc052
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250823T1500&p1=248
• Duration: 4 hours
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

AtCoder Heuristic Contest (AHC) is a series of programming contests held regularly on AtCoder. Unlike algorithm contests such as ABC/ARC/AGC, the goal is to create a better solution to a problem for which it is difficult to find the optimal solution.

This contest is one of the qualifying contests for AtCoder World Tour Finals 2026 to crown the world champion of AtCoder players. Please refer to this post for more details.

After the contest ends, all participants can post their approach on the Editorial tab. Please share your approach.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 420.

• Contest URL: https://atcoder.jp/contests/abc420
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250824T2100&p1=248
• Duration: 100 minutes
• Writer: sounansya, physics0523
• Tester: MMNMM, sheyasutaka
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-550-575

We are looking forward to your participation!

We will hold AtCoder Regular Contest 204 (Div. 1).

• Contest URL: https://atcoder.jp/contests/arc204
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250817T2100&p1=248
• Duration: 150 minutes
• Number of Tasks: 4
• Writer: potato167
• Tester: Nyaan, maspy
• Rated range: 1600 ~ 2999

The point values will be 700-800-900-1000.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 419.

• Contest URL: https://atcoder.jp/contests/abc419
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250816T2100&p1=248
• Duration: 100 minutes
• Writer: cn449, toam, chokudai
• Tester: Nyaan, kyopro_friends
• Rated range: ~ 1999
• The point values: 100-200-300-400-475-550-600

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 418.

• Contest URL: https://atcoder.jp/contests/abc418
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250809T2100&p1=248
• Duration: 100 minutes
• Writer: Nyaan, sheyasutaka
• Tester: toam, yuto1115
• Rated range: ~ 1999
• The point values: 100-200-350-425-475-550-650

We are looking forward to your participation!

We will hold AtCoder Regular Contest 203 (Div. 2).

• Contest URL: https://atcoder.jp/contests/arc203
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250803T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 5
• Writer: vwxyz
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2399

The point values will be 400-500-600-800-800.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 417.

• Contest URL: https://atcoder.jp/contests/abc417
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250802T2100&p1=248
• Duration: 100 minutes
• Writer: math957963, MMNMM, tatyam
• Tester: physics0523, sounansya
• Rated range: ~ 1999
• The point values: 100-200-300-425-475-500-625

We are looking forward to your participation!

We will hold THIRD Programming Contest 2025 Summer（AtCoder Heuristic Contest 051）.

• Contest URL: https://atcoder.jp/contests/ahc051
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250801T1900&p1=248
• Duration: 10 days
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

AtCoder Heuristic Contest (AHC) is a series of programming contests held regularly on AtCoder. Unlike algorithm contests such as ABC/ARC/AGC, the goal is to create a better solution to a problem for which it is difficult to find the optimal solution.

This contest is one of the qualifying contests for AtCoder World Tour Finals 2026 to crown the world champion of AtCoder players. Please refer to this post for more details.

After the contest ends, all participants can post their approach on the Editorial tab. Please share your approach.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 416.

• Contest URL: https://atcoder.jp/contests/abc416
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250726T2100&p1=248
• Duration: 100 minutes
• Writer: kyopro_friends, sounansya
• Tester: sheyasutaka, cn449
• Rated range: ~ 1999
• The point values: 100-250-300-400-450-525-625

We are looking forward to your participation!

We will hold AtCoder Regular Contest 202 (Div. 1).

• Contest URL: https://atcoder.jp/contests/arc202
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250720T2100&p1=248
• Duration: 150 minutes
• Number of Tasks: 4
• Writer: Nyaan
• Tester: maspy
• Rated range: 1600 ~ 2999

The point values will be 700-800-900-1000.

Please note that starting from this contest, AtCoder Rules against Generative AI will also apply to ARC Div.1.

We are looking forward to your participation!

We will hold Japan Registry Services (JPRS) Programming Contest 2025#2 (AtCoder Beginner Contest 415).

• Contest URL: https://atcoder.jp/contests/abc415
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250719T2100&p1=248
• Duration: 100 minutes
• Writer: yuto1115, physics0523
• Tester: MMNMM, math957963
• Rated range: ~ 1999
• The point values: 100-200-350-400-450-525-575

We are looking forward to your participation!

We will hold AtCoder World Tour Finals 2025.

• Contest URL: https://atcoder.jp/contests/awtf2025heuristic
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250716T0900&p1=248
• Duration: 10 hours
• Writer: wata_admin

List of Finalists: https://info.atcoder.jp/entry/awtf-Heuristic-finalist-2025-en

AtCoder World Tour Finals 2025 is an international onsite contest. We have invited top-runners of AtCoder Race Ranking 2024 to Tokyo. On the contest day, we will stream the contest on our YouTube channel. For more details, please visit this page (https://info.atcoder.jp/more/contents/awtf/2025) .

As a new initiative, the stream will feature AI-generated explanations of submitted code. While the main commentary will be in Japanese, the code explanations will be translated into English.

As part of the event, OpenAI will participate as a sponsor, and a special exhibition match titled “Humans vs AI” will be held, where top human programmers compete against a cutting-edge AI developed by OpenAI.

There will be no open contest for this final. We hope you enjoy watching the event!