HACK TO THE FUTURE 2027 (AtCoder Heuristic Contest 074) has just started!

• Contest URL: https://atcoder.jp/contests/ahc074
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261030T1900&p1=248
• Duration: 10 days
• Division Change Deadline: Within 48 hours after the contest starts.
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

This contest is one of the qualifying contests for AWTF 2027.

This contest will be held in two divisions: the Human only division, where the use of generative AI is prohibited, and the With AI division, where generative AI can be used freely.

Whether you're looking to make greater use of generative AI or prefer to tackle challenges without relying on it, we look forward to your participation!

We will hold AtCoder Beginner Contest 482.

• Contest URL: https://atcoder.jp/contests/abc482
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261031T2100&p1=248
• Duration: 100 minutes
• Writer: Nyaan, KumaTachiRen, milkcoffeen
• Tester: kyopro_friends, vwxyz0
• Rated range: ~ 1999
• The point values: 100-200-300-400-475-525-650

We are looking forward to your participation!

We will hold AtCoder Regular Contest++ 233.

• Contest URL: https://atcoder.jp/contests/arc233
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261025T2100&p1=248
• Duration: 150 minutes
• Writer: vwxyz0
• Tester: Nyaan, maspy
• Rated range: 1600 ~ 2999
• Point Values: 700-900-900-900

We are looking forward to your participation!

We will hold SMBC Programming Contest #2 (AtCoder Beginner Contest 481）.

• Contest URL: https://atcoder.jp/contests/abc481
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261024T2100&p1=248
• Duration: 100 minutes
• Writer: sheyasutaka, harurun4635, vwxyz0
• Tester: physics0523, sounansya
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-600

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 480.

• Contest URL: https://atcoder.jp/contests/abc480
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261017T2100&p1=248
• Duration: 100 minutes
• Writer: vwxyz0, kyopro_friends
• Tester: MMNMM, KumaTachiRen
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-600

We are looking forward to your participation!

We will hold AtCoder Heuristic Contest 073.

• Contest URL: https://atcoder.jp/contests/ahc073
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261017T1500&p1=248
• Duration: 4 hours
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

This contest is one of the qualifying contests for AWTF 2027.

We are looking forward to your participation!

Original Post on AtCoder

We have updated the generative‑AI rules in ABC,ARC,and AGC. In addition to this, we explicitly prohibit code obfuscation.

Rules

For the full rules, please see:

• AtCoder Rules against Generative AI — Version 20261014

Changes to the Rules

• If you want to use code created by generative AI during a contest, you should publish the code before the contest begins and include the URL in your submission.
• Code obfuscation is now explicitly prohibited.
• If you convert code to binary form and embed it, you must ensure that the original source code can be inspected. (applied from October 20th)

For the detailed diff, please see this.

(Edit on October 20): We added the rule about binary embedding. We also added more explanations.

We will hold AtCoder Beginner Contest 479.

• Contest URL: https://atcoder.jp/contests/abc479
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261011T2100&p1=248
• Duration: 100 minutes
• Writer: physics0523, cn449
• Tester: sheyasutaka, physics0523
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-500-600

We are looking forward to your participation!

We will hold AtCoder Regular Contest++ 232. Note that it's on Saturday, not Sunday.

• Contest URL: https://atcoder.jp/contests/arc232
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261010T2100&p1=248
• Duration: 150 minutes
• Writer: maroonrk
• Tester: snuke, blackyuki
• Rated range: 1600 — 2999
• Point Values: 800-800-800-800-1100

We are looking forward to your participation!

We will hold AtCoder Regular Contest 231.

• Contest URL: https://atcoder.jp/contests/arc231
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261004T2100&p1=248
• Duration: 120 minutes
• Writer: Mitsubachi
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2799
• Point Values: 500-500-600-700-800-800

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 478.

• Contest URL: https://atcoder.jp/contests/abc478
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261003T2100&p1=248
• Duration: 100 minutes
• Writer: MMNMM, KumaTachiRen, toam
• Tester: harurun4635, kyopro_friends
• Rated range: ~ 1999
• The point values: 100-200-300-400-475-525-625

We are looking forward to your participation!

We will hold UNICORNProgramming Contest2026(AtCoder Beginner Contest 477).

• Contest URL: https://atcoder.jp/contests/abc477
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260926T2100&p1=248
• Duration: 100 minutes
• Writer: Nyaan, harurun4635, vwxyz0
• Tester: cn449, physics0523
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-625

We are looking forward to your participation!

We will hold ALGO ARTIS Programming Contest 2026 September（AtCoder Heuristic Contest 072）.

• Contest URL: https://atcoder.jp/contests/ahc072
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260925T1900&p1=248
• Duration: 10 days
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

This contest is one of the qualifying contests for AWTF 2027.

We are looking forward to your participation!

We will hold AtCoder Regular Contest++ 230.

• Contest URL: https://atcoder.jp/contests/arc230
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260920T2100&p1=248
• Duration: 150 minutes
• Writer: noya2
• Tester: maspy, potato167
• Rated range: 1600 — 2999
• Point Values: 600-800-800-900-1200

We are looking forward to your participation!

We will hold JIJ Programming Contest 2026（AtCoder Beginner Contest 476）.

• Contest URL: https://atcoder.jp/contests/abc476
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260919T2100&p1=248
• Duration: 100 minutes
• Writer: sheyasutaka, sounansya, vwxyz0
• Tester: sounansya, vwxyz0
• Rated range: ~ 1999
• The point values: 100-200-300-425-450-525-625

We are looking forward to your participation!

We will hold AtCoder Heuristic Contest 071.

• Contest URL: https://atcoder.jp/contests/ahc071
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260913T1900&p1=248
• Duration: 4 hours
• Writer: wata_admin
• Rated range: All (Heuristic Rating)

This contest is one of the qualifying contests for AWTF 2027.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 475.

• Contest URL: https://atcoder.jp/contests/abc475
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260912T2100&p1=248
• Duration: 100 minutes
• Writer: kyopro_friends, cn449
• Tester: Nyaan, MMNMM
• Rated range: ~ 1999
• The point values: 100-200-300-400-475-525-575

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 474.

• Contest URL: https://atcoder.jp/contests/abc474
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260906T1310&p1=248 (Irregular start time!)
• Duration: 100 minutes
• Writer: sounansya, vwxyz0
• Tester: harurun4635, KumaTachiRen
• 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-- 229.

• Contest URL: https://atcoder.jp/contests/arc229
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260905T2100&p1=248 ( Saturday! )
• Duration: 120 minutes
• Writer: sounansya, Nyaan, snuke
• Tester: sounansya, Nyaan
• Rated range: 800 ~ 2399
• Point Values: 400-500-500-600-600-600

We are looking forward to your participation!

We will hold AtCoder Regular Contest++ 228.

• Contest URL: https://atcoder.jp/contests/arc228
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260830T2100&p1=248
• Duration: 150 minutes
• Writer: PCTprobability
• Tester: maspy, Nyaan
• Rated range: 1600 — 2999
• Point Values: 800-800-900-1000-1200

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 473.

• Contest URL: https://atcoder.jp/contests/abc473
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260829T2100&p1=248
• Duration: 100 minutes
• Writer: MMNMM, physics0523, vwxyz0, sheyasutaka
• Tester: sheyasutaka, kyopro_friends
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-600

We are looking forward to your participation!

We will hold 13th Asprova Programming Contest（AtCoder Heuristic Contest 070）.

• Contest URL: https://atcoder.jp/contests/ahc070
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260829T1500&p1=248
• Duration: 4 hours
• Writer：HNN_8127
• Tester: iaNTU, Koi51, kozima, mya3, and others.
• Rated range: All (Heuristic Rating)

This contest is one of the qualifying contests for AWTF 2027.

Starting with this short contest, the use of generative AI will be prohibited, with limited exceptions. Please refer to this post for further details.

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 472.

• Contest URL: https://atcoder.jp/contests/abc472
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260822T2100&p1=248
• Duration: 100 minutes
• Writer: harurun4635, KumaTachiRen, sheyasutaka
• Tester: math957963, cn449
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-600

We are looking forward to your participation!

We will hold AtCoder Regular Contest 227.

• Contest URL: https://atcoder.jp/contests/arc227
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260816T2100&p1=248
• Duration: 120 minutes
• Writer: yosupo
• Tester: Nyaan, sigma425
• Rated range: 1200 ~ 2799
• Point Values: 400-500-700-700-700-800

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 471.

• Contest URL: https://atcoder.jp/contests/abc471
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260815T2100&p1=248
• Duration: 100 minutes
• Writer: kyopro_friends, sheyasutaka
• Tester: vwxyz0, physics0523
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-550-600

We are looking forward to your participation!