We will hold AtCoder Heuristic Contest 057.

• Contest URL: https://atcoder.jp/contests/ahc057
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251129T1500&p1=248
• Duration: 4 hours
• Writer: PrussianBlue
• 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 Regular Contest 211 (Div. 2).

• Contest URL: https://atcoder.jp/contests/arc211
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251130T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 5
• Writer: hirayuu_cf
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2399

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

We are looking forward to your participation!

We will hold Ｓｋｙ Inc, Programming Contest 2025 (AtCoder Beginner Contest 434).

• Contest URL: https://atcoder.jp/contests/abc434
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251129T2100&p1=248
• Duration: 100 minutes
• Writer: Nyaan, physics0523
• Tester: sheyasutaka, yuto1115
• Rated range: ~ 1999
• The point values: 100-200-300-425-500-575-650

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 433.

• Contest URL: https://atcoder.jp/contests/abc433
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251122T2100&p1=248
• Duration: 100 minutes
• Writer: sounansya
• Tester: MMNMM, kyopro_friends
• 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 210.

• Contest URL: https://atcoder.jp/contests/arc210
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251116T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 6
• Writer: maspy
• Tester: Nyaan
• Rated range: 1200 ~ 2799

The point values will be 300-600-700-800-1000-1100.

We are looking forward to your participation!

We will hold OMRON Corporation Programming Contest 2025 #2 (AtCoder Beginner Contest 432).

• Contest URL: https://atcoder.jp/contests/abc432
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251115T2100&p1=248
• Duration: 100 minutes
• Writer: sheyasutaka, yuto1115
• Tester: math957963, physics0523
• Rated range: ~ 1999
• The point values: 100-200-350-425-450-525-575

We are looking forward to your participation!

We will hold AtCoder Regular Contest 209 (Div. 1).

• Contest URL: https://atcoder.jp/contests/arc209
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251109T2100&p1=248
• Duration: 150 minutes
• Number of Tasks: 5
• Writer: blackyuki, Kodaman, PCTprobability
• Tester: Nyaan, maspy
• Rated range: 1600 ~ 2999

The point values will be 700-700-900-900-1100.

We are looking forward to your participation!

We will hold TOYOTA SYSTEMS Programming Contest 2025（AtCoder Beginner Contest 431).

• Contest URL: https://atcoder.jp/contests/abc431
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251108T2100&p1=248
• Duration: 100 minutes
• Writer: toam, MMNMM
• Tester: sounansya, cn449
• Rated range: ~ 1999
• The point values: 100-200-300-400-500-500-575

We are looking forward to your participation!

We will hold HACK TO THE FUTURE 2026 （AtCoder Heuristic Contest 056）.

• Contest URL: https://atcoder.jp/contests/ahc056
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251107T1900&p1=248
• Duration: 10 days
• Writer: wata_admin
• Staff: tsukammo, kudryavka_chan, platinum, ppputtyo, syunsuke
• 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 430.

• Contest URL: https://atcoder.jp/contests/abc430
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251101T2100&p1=248
• Duration: 100 minutes
• Writer: kyopro_friends, physics0523
• Tester: sheyasutaka, Nyaan
• Rated range: ~ 1999
• The point values: 100-250-300-400-450-500-625

We have updated the rating system. As these changes will apply starting with this contest, please see this post for details.

We are looking forward to your participation!

We will hold Polaris.AI Programming Contest 2025（AtCoder Beginner Contest 429）.

• Contest URL: https://atcoder.jp/contests/abc429
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251025T2100&p1=248
• Duration: 100 minutes
• Writer: math957963, sounansya, physics0523
• Tester: yuto1115, MMNMM
• Rated range: ~ 1999
• The point values: 100-200-300-425-450-525-625

We are looking forward to your participation!

We will hold RECRUIT Nihonbashi Half Marathon 2025 Autumn （AtCoder Heuristic Contest 055）.

• Contest URL: https://atcoder.jp/contests/ahc055
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251019T1900&p1=248
• Duration: 4 hours
• Staff: cozy_sauna, crinoid_t, dpforest, eha, FLOPPY_30, frnfnts, hamray, hashiryo, hedwig, japlj, kanra824, kys, miz56, n_knuu, roiti, ruthen71, samasama, shichinomiya, shiratty8, smiken, sugim48, suzume, tomerun, yupiteru, yusk
• 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 428.

• Contest URL: https://atcoder.jp/contests/abc428
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20251018T2100&p1=248
• Duration: 100 minutes
• Writer: sheyasutaka, Nyaan
• Tester: sounansya, physics0523
• Rated range: ~ 1999
• The point values: 150-200-300-400-475-525-625

We are looking forward to your participation!

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!