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!

We will hold Mirrativ Programming Contest 2025 (AtCoder Beginner Contest 414).

• Contest URL: https://atcoder.jp/contests/abc414
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250712T2100&p1=248
• Duration: 100 minutes
• Writer: sheyasutaka, toam, sounansya
• Tester: Nyaan, kyopro_friends
• Rated range: ~ 1999
• The point values: 100-200-350-400-475-525-625

We are looking forward to your participation!

We will hold AtCoder Heuristic Contest 050.

• Contest URL: https://atcoder.jp/contests/ahc050
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250706T1900&p1=248
• Duration: 4 hours
• Writer: physics0523
• 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 Denso Create Programming Contest 2025（AtCoder Beginner Contest 413）.

• Contest URL: https://atcoder.jp/contests/abc413
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250705T2100&p1=248
• Duration: 100 minutes
• Writer: MMNMM, MtSaka, sounansya, toam, PCTprobability
• Tester: yuto1115, physics0523
• Rated range: ~ 1999
• The point values: 100-200-300-425-450-525-575

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 412.

• Contest URL: https://atcoder.jp/contests/abc412
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250628T2100&p1=248
• Duration: 100 minutes
• Writer: Nyaan, cn449
• Tester: toam, sounansya
• Rated range: ~ 1999
• The point values: 100-200-300-425-500-525-650

We are looking forward to your participation!

We will hold Toyota Programming Contest 2025#3（AtCoder Heuristic Contest 049）.

• Contest URL: https://atcoder.jp/contests/ahc049
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250621T1500&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 Regular Contest 201.

• Contest URL: https://atcoder.jp/contests/arc201
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250622T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 6
• Writer: snuke
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2799

The point values will be 500-500-600-700-800-1000.

Please note that the rated range differs from usual, as this ARC also serves as a qualifying round for a domestic contest in Japan.

We are looking forward to your participation!

We will hold UNIQUE VISION Programming Contest 2025 Summer (AtCoder Beginner Contest 411).

• Contest URL: https://atcoder.jp/contests/abc411
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250621T2100&p1=248
• Duration: 100 minutes
• Writer: yuto1115, math957963, ynymxiaolongbao, toam
• Tester: sheyasutaka, MMNMM
• Rated range: ~ 1999
• The point values: 100-200-350-425-450-525-600

We are looking forward to your participation!

We will hold AtCoder Regular Contest 200 (Div. 2).

• Contest URL: https://atcoder.jp/contests/arc200
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250615T2100&p1=248
• Duration: 120 minutes
• Number of Tasks: 5
• Writer: sounansya
• Tester: Nyaan, maspy
• Rated range: 1200 ~ 2399

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

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 410.

• Contest URL: https://atcoder.jp/contests/abc410
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250614T2100&p1=248
• Duration: 100 minutes
• Writer: physics0523, kyopro_friends
• Tester: nok0, MMNMM
• Rated range: ~ 1999
• The point values: 100-200-300-400-450-525-575

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 409.

• Contest URL: https://atcoder.jp/contests/abc409
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250607T2100&p1=248
• Duration: 100 minutes
• Writer: sotanishy, toam
• Tester: math957963, cn449
• Rated range: ~ 1999
• The point values: 100-200-300-400-425-500-625

We are looking forward to your participation!

We will hold AtCoder Regular Contest 199 (Div. 1).

• Contest URL: https://atcoder.jp/contests/arc199
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250601T2100&p1=248
• Duration: 150 minutes
• Number of Tasks: 4
• Writer: toam
• Tester: sotanishy, maspy
• Rated range: 1600 ~ 2999

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

We are looking forward to your participation!

We will hold AtCoder Beginner Contest 408.

• Contest URL: https://atcoder.jp/contests/abc408
• Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250531T2100&p1=248
• Duration: 100 minutes
• Writer: MtSaka, sounansya
• Tester: Nyaan, yuto1115
• Rated range: ~ 1999
• The point values: 150-150-300-400-450-500-625

We are looking forward to your participation!