We will hold JR WEST and ALGO ARTIS Programming Contest (AtCoder Heuristic Contest 064).

• Contest URL: https://atcoder.jp/contests/ahc064
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260426T1500&p1=248
• Duration: 4 hours
• Writer: ryomac1, Jirotech, yochan, yunix
• 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 2027 to crown the world champion of AtCoder players.

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 Ｓｋｙ Inc, Programming Contest 2026 (AtCoder Beginner Contest 455).

• Contest URL: https://atcoder.jp/contests/abc455
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260425T2100&p1=248
• Duration: 100 minutes
• Writer: cn449, vwxyz0, sheyasutaka
• Tester: MMNMM, physics0523
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-625

We are looking forward to your participation!

We will hold Keysight Technologies Programming Contest（AtCoder Beginner Contest 454）.

• Contest URL: https://atcoder.jp/contests/abc454
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260418T2100&p1=248
• Duration: 100 minutes
• Writer: sounansya, Nyaan
• Tester: sheyasutaka, harurun4635
• Rated range: ~ 1999
• The point values: 100-200-300-425-450-525-625

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 453.

• Contest URL: https://atcoder.jp/contests/abc453
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260411T2100&p1=248
• Duration: 100 minutes
• Writer: physics0523, math957963, KumaTachiRen, kyopro_friends, blackyuki
• Tester: kyopro_friends, KumaTachiRen
• Rated range: ~ 1999
• The point values: 100-200-300-425-475-550-600

We are looking forward to your participation!

We will hold AtCoder Regular Contest 217.

• Contest URL: https://atcoder.jp/contests/arc217
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260405T2100&p1=248
• Duration: 120 minutes
• Writer: nok0, sounansya
• Tester: maspy
• Rated range: 1200 ~ 2799
• Point Values: 500-700-700-700-900

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 452.

• Contest URL: https://atcoder.jp/contests/abc452
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260404T2100&p1=248
• Duration: 100 minutes
• Writer: sheyasutaka, MMNMM, blackyuki
• Tester: vwxyz0, Nyaan
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-500-600

We are looking forward to your participation!

We will hold AtCoder Heuristic Contest 063.

• Contest URL: https://atcoder.jp/contests/ahc063
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260403T1900&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 2027 to crown the world champion of AtCoder players.

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 451.

• Contest URL: https://atcoder.jp/contests/abc451
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260328T2100&p1=248
• Duration: 100 minutes
• Writer: KumaTachiRen, harurun4635, toam
• Tester: cn449, sounansya
• Rated range: ~ 1999
• The point values: 100-200-300-400-475-500-600

We are looking forward to your participation!

We will hold AtCoder Regular Contest++ 216.

• Contest URL: https://atcoder.jp/contests/arc216
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260322T2100&p1=248
• Duration: 150 minutes
• Writer: toam
• Tester: Nyaan, tatyam
• Rated range: 1600 ~ 2999
• Point Values: 700-700-800-1000-1000

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 450.

• Contest URL: https://atcoder.jp/contests/abc450
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260321T2100&p1=248
• Duration: 100 minutes
• Writer: vwxyz0, kyopro_friends, toam, nok0
• Tester: MMNMM, physics0523
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-575

We are looking forward to your participation!

We will hold UNIQUE VISION Programming Contest 2026 Spring (AtCoder Heuristic Contest 062).

• Contest URL: https://atcoder.jp/contests/ahc062
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260314T1500&p1=248
• Duration: 4 hours
• Writer: Kiri8128
• 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 2027 to crown the world champion of AtCoder players.

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 449.

• Contest URL: https://atcoder.jp/contests/abc449
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260314T2100&p1=248
• Duration: 100 minutes
• Writer: sounansya, cn449, toam
• Tester: harurun4635, KumaTachiRen
• Rated range: ~ 1999
• The point values: 100-200-300-425-475-500-600

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 448.

• Contest URL: https://atcoder.jp/contests/abc448
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260307T2100&p1=248
• Duration: 100 minutes
• Writer: Nyaan, physics0523, toam, ynymxiaolongbao, kyopro_friends
• Tester: sheyasutaka, math957963
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-675

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 447.

• Contest URL: https://atcoder.jp/contests/abc447
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260228T2100&p1=248
• Duration: 100 minutes
• Writer: harurun4635, yuto1115, kyopro_friends
• Tester: kyopro_friends, vwxyz0
• Rated range: ~ 1999
• The point values: 100-200-300-400-475-500-625

We are looking forward to your participation!

AtCoder Regular Contest (ARC) will primarily be held in the traditional format (rated 1200–2799) starting from ARC215.

Div.1/Div.2 will be renamed to "AtCoder Regular Contest ++" / "AtCoder Regular Contest --" respectively, and will continue to be held.

The format for each Division will be adjusted as follows.

• ARC++
  • Rated range: 1600–2999
  • Contest duration: 150 minutes
  • Problems: 4–5 problems worth approximately 600–1000 points
• ARC
  • Rated range: 1200–2799
  • Contest duration: 120 minutes
  • Problems: 5–6 problems worth approximately 400–800 points
• ARC--
  • Rated range: 800–2399
  • Contest duration: 120 minutes
  • Problems: 6–7 problems worth approximately 300–700 points

For details, please see this post.

We will hold AtCoder Regular Contest 215.

• Contest URL: https://atcoder.jp/contests/arc215
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260222T2100&p1=248
• Duration: 120 minutes
• Writer: ynymxiaolongbao
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2799
• Point Values: 500-500-600-600-700-700

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 446.

• Contest URL: https://atcoder.jp/contests/abc446
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260221T2100&p1=248
• Duration: 100 minutes
• Writer: math957963, sheyasutaka, physics0523, sounansya
• Tester: sounansya, toam, 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 Beginner Contest 445.

• Contest URL: https://atcoder.jp/contests/abc445
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260214T2100&p1=248
• Duration: 100 minutes
• Writer: KumaTachiRen, MMNMM, sheyasutaka
• Tester: physics0523, yuto1115
• Rated range: ~ 1999
• The point values: 100-200-300-425-475-500-600

We are looking forward to your participation!

We will hold THIRD Programming Contest 2026（AtCoder Heuristic Contest 061）.

• Contest URL: https://atcoder.jp/contests/ahc061
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260213T1900&p1=248
• Duration: 10 days
• Writer: Shun_PI
• 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 2027 to crown the world champion of AtCoder players.

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 214.

• Contest URL: https://atcoder.jp/contests/arc214
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260208T2100&p1=248
• Duration: 120 minutes
• Writer: snuke
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2799
• Point Values: 300-500-600-700-700-900

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 444.

• Contest URL: https://atcoder.jp/contests/abc444
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260207T2100&p1=248
• Duration: 100 minutes
• Writer: vwxyz0, kyopro_friends, ynymxiaolongbao, toam
• Tester: Nyaan, cn449
• Rated range: ~ 1999
• The point values: 100-200-350-400-450-550-675

We will hold RECRUIT Nihonbashi Half Marathon 2026 Winter (AtCoder Heuristic Contest 060).

• Contest URL: https://atcoder.jp/contests/ahc060
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260201T1900&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 2027 to crown the world champion of AtCoder players.

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 Denso Create Programming Contest 2026（AtCoder Beginner Contest 443）.

• Contest URL: https://atcoder.jp/contests/abc443
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260131T2100&p1=248
• Duration: 100 minutes
• Writer: sounansya, physics0523, kyopro_friends, ynymxiaolongbao
• Tester: MMNMM, math957963
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-575

We are looking forward to your participation!

We will hold AtCoder Regular Contest 213 (Div. 1).

• Contest URL: https://atcoder.jp/contests/arc213
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260125T2100&p1=248
• Duration: 150 minutes
• Number of Tasks: 4
• Writer: leaf1415, vwxyz0, Nyaan, potato167
• Tester: maspy, Nyaan
• Rated range: 1600 ~ 2999

The point values will be 600-800-900-1100.

We are looking forward to your participation!

We will hold JPRS Programming Contest 2026#1 (AtCoder Beginner Contest 442).

• Contest URL: https://atcoder.jp/contests/abc442
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260124T2100&p1=248
• Duration: 100 minutes
• Writer: cn449, yuto1115, ynymxiaolongbao, chokudai
• Tester: kyopro_friends, sheyasutaka
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-500-600

We are looking forward to your participation!