Contest Archive - AtCoder

AtCoder Beginner Contest 469

Sat, 01 Aug 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

AtCoder is one of the world's largest competitive programming platforms, with over 900,000 registered users worldwide. Our contests attract thousands of highly skilled programmers, students, and engineers.

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	475
F	500
G	575

Contest Rules

This contest is full-feedback (solutions are judged during the contest).
When you solve a problem, you get a score assigned to it. Competitors are ranked first by total scores, then by penalties. The penalties are computed as (the time you spend to get your current score) + (5 minutes) * (the number of incorrect attempts).

Useful Links

AtCoder Beginner Contest 468

Sat, 25 Jul 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	450
F	500
G	550

Contest Rules

Useful Links

AtCoder Regular Contest 225

Sun, 19 Jul 2026 12:00:00 GMT

Contest Information

Duration: 120 minutes
Writer: milkcoffee
Rated Range: 1200 - 2799

Point Values

Task	Score
A	500
B	600
C	600
D	600
E	900

Contest Rules

Useful Links

AtCoder Beginner Contest 467

Sat, 18 Jul 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	425
E	450
F	525
G	625

Contest Rules

Useful Links

estie Programming Contest 2026 (AtCoder Heuristic Contest 068)

Sat, 18 Jul 2026 06:00:00 GMT

Contest Information

writer: wata_admin
You can earn GP30 scores for AWTF2027.

Rules

There is one problem. You can use any programming language available on AtCoder.
There is no penalty for resubmission, but you must wait at least 5 minutes between submissions.
This is an individual competition. It is prohibited to publish your solution before the end of the contest. However, you are free to share information on how to run the provided tools.
There are restrictions on certain uses of generative AI. Please refer to the following document for details: AtCoder Heuristic Contest Generative AI Usage Rules - Version 20250616. This will be the final short contest to which the current generative AI rules apply. Starting with the next short contest, the new generative AI rules will take effect.
For other rules, see here.

Use of Generative AI

Under the current “AtCoder Heuristic Contest Generative AI Usage Rules — Version 20250616,” it is prohibited to have an AI agent execute a solution program and automatically repeat improvements based on the execution results.

However, with the latest generative AI systems, the distinction between conversational services such as ChatGPT and AI agents such as Codex has become increasingly blurred. Even conversational services may, without an explicit instruction from the user, internally generate test cases, execute a solution program, and automatically repeat improvements based on the execution results.

Some participants already explicitly instruct generative AI systems not to engage in such behavior. To ensure fairness among participants and to enforce the intent of the current rules, anyone using generative AI in this contest must provide the instruction below either at the beginning of each chat or through a custom instruction, project instruction, or instruction file automatically loaded by the relevant generative AI tool, such as AGENTS.md or CLAUDE.md.

I am currently participating in an AtCoder Heuristic Contest, and I will use this generative AI to assist in developing my solution.

When using this generative AI, the "AtCoder Heuristic Contest Generative AI Usage Rules - Version 20250616" apply.

https://info.atcoder.jp/entry/ahc-llm-rules-en

Most importantly, after running the solution program, you must not modify or improve the solution, its approach, or its code based on the execution results unless the user gives a new explicit instruction to do so.

You may run the solution program and report its execution results, logs, scores, or other observations. After reporting them, you must stop and wait for a new instruction from the user before making any improvement based on those results.

Here, "solution program" refers to any program created or being created for the purpose of solving this contest problem, regardless of whether it was created by the user or by generative AI, and regardless of whether it is still in progress or already complete.

AtCoder Regular Contest-- 224

Sun, 12 Jul 2026 12:00:00 GMT

Contest Information

Duration: 120 minutes
Writer: sheyasutaka, ynymxiaolongbao, physics0523
Rated Range: 800 - 2399

Point Values

Task	Score
A	300
B	400
C	500
D	500
E	500
F	700

Contest Rules

Useful Links

AtCoder Beginner Contest 466

Sat, 11 Jul 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	450
F	500
G	600

Contest Rules

Useful Links

World Tour Finals 2026 Algorithm（Open Contest）

Thu, 09 Jul 2026 02:00:00 GMT

World Tour Finals 2026 Algorithm

Thu, 09 Jul 2026 02:00:00 GMT

World Tour Finals 2026 Heuristic

Tue, 07 Jul 2026 00:00:00 GMT

AtCoder Beginner Contest 465

Sat, 04 Jul 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	450
F	525
G	625

Contest Rules

Useful Links

AtCoder Regular Contest 223

Sun, 28 Jun 2026 12:00:00 GMT

Contest Information

Duration: 120 minutes
Writer: vwxyz
Rated Range: 1200 - 2799

Point Values

Task	Score
A	400
B	500
C	500
D	600
E	700
F	800

Contest Rules

Useful Links

Japanese Student Championship 2026 -Advance- Qualification (AtCoder Beginner Contest 464)

Sat, 27 Jun 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	450
F	550
G	625

Contest Rules

This contest is full-feedback (solutions are judged during the contest).

When you solve a problem, you get a score assigned to it. Competitors are ranked first by total scores, then by penalties. The penalties are computed as (the time you spend to get your current score) + (5 minutes) * (the number of incorrect attempts).

Useful Links

AtCoder Heuristic Contest 067

Sun, 21 Jun 2026 10:00:00 GMT

Contest Information

writer: wata_admin
You can earn GP30 scores for AWTF2027.

Rules

There is one problem. You can use any programming language available on AtCoder.
There is no penalty for resubmission, but you must wait at least 5 minutes between submissions.
This is an individual competition. It is prohibited to publish your solution before the end of the contest. However, you are free to share information on how to run the provided tools.
There are restrictions on certain uses of generative AI. Please refer to the following document for details: AtCoder Heuristic Contest Generative AI Usage Rules - Version 20250616.
For other rules, see here.

AtCoder Beginner Contest 463

Sat, 20 Jun 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	450
F	500
G	600

Contest Rules

Useful Links

Japanese Student Championship 2026 Qualification (AtCoder Regular Contest 222)

Sun, 14 Jun 2026 12:00:00 GMT

Contest Information

Duration: 120 minutes
Writer: maspy
Rated Range: 1200 - 2799

Point Values

Task	Score
A	300
B	500
C	700
D	700
E	700
F	700

Contest Rules

This contest is full-feedback (solutions are judged during the contest).

When you solve a problem, you get a score assigned to it. Competitors are ranked first by total scores, then by penalties. The penalties are computed as (the time you spend to get your current score) + (5 minutes) * (the number of incorrect attempts).

Useful Links

CodeQUEEN 2026 -qual- (AtCoder Beginner Contest 462)

Sat, 13 Jun 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Point Values

Task	Score
A	100
B	200
C	300
D	400
E	450
F	500
G	575

Contest Rules

Useful Links

AtCoder Beginner Contest 461

Sat, 06 Jun 2026 12:00:00 GMT

Contest Information

Duration: 100 minutes
Rated Range: 0 - 1999

Promote Your Company through AtCoder Contests

Sponsorship Benefits

Introduce your company on the contest page
Post a link to your recruitment or corporate website
Reach talented programmers around the world
Receive participant information only from users who agree to provide it to the sponsor

AtCoder offers several contest formats, including AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Heuristic Contest (AHC).

If you are interested in sponsoring an AtCoder contest, please note that communication will be conducted via text-based communication, such as e-mail or chat.

For more details, please visit: AtCoderContest.pdf

About the New Judge

This contest will be conducted using a new judge. Please thoroughly check the available languages and versions before participating.
For information on available languages, versions, and libraries, please check here.
Display format for TLE and MLE has been changed.
If there are critical issues like InternalError, please notify us in Clar with the relevant submission attached.
We have already closed requests regarding versions and libraries, hence we cannot address them.

Point Values

Task	Score
A	100
B	200
C	300
D	425
E	475
F	500
G	625

Contest Rules

Useful Links

AtCoder Regular Contest++ 221

Sun, 31 May 2026 12:00:00 GMT

Contest Information

Duration: 150 minutes
Writer: tatyam, sounansya, toam, noya2, hirayuu_At
Rated Range: 1600 - 2999

Point Values

Task	Score
A	600
B	800
C	800
D	800
E	1000