One of the oldest computer science competitions with 40 years of history

Approved by the National Association of Secondary School Principals (NASSP)

Authenticated by the Computer Science Teachers Association

Sponsored by Google, ADOBE and other advanced technology companies

Based on cumulative team scores, top teams are invited to the All-Star Contest

4 different levels suitable for students from Years 3 to 12

Past papers are available for preparation

December, 2020 - August, 2021


ACSL organizes computer science contests and computer programming contests for elementary, junior, and senior high school students. This year, our 41st year of continuous operation, over 300 teams in the United States, Canada, Europe, Africa and Asia are participating in various divisions. ACSL is on the approved activities list of the National Association of Secondary School Principals (NASSP). ACSL is also an institutional member of the Computer Science Teachers Association.

Official Website:

Competition Rules


Chinese & English

  • Preliminary:round 1 (Top 75% enter Final rounds)
  • Final: Round 2-4


  • Round 1: 19 Dec, 2020 14:00-16:40
  • Round 2: 20 Feb, 2021 14:00-16:40
  • Round 3: 21 Mar, 2021 14:00-16:40
  • Round 4: 25 Apr, 2021 10:00-12:40

All-Star Contest: August, 2021, Beijing


• Online (exam computer or phone must be equipped with a camera)
• Exam Centers across China

Programming Language

Any programming language you are good at



  • The Senior Division is geared to those high school students with experience in programming, especially those who are taking a Computer Science AP course. We suggest that students do not register for the Senior Division during their first year of ACSL participation.
  • The Intermediate Division is geared towards senior high school students with computer programming experience, and advanced junior high students.
  • The Junior Division is geared to middle school students with no previous experience in programming. No student beyond grade 9 may compete in the Junior Division.
  • The Elementary Division is open to students from grades 3 -6. It consists of non-programming problems. Four categories, one each contest, will be tested. The contest consists of a 30-minute, 5-question test each month.

Note: Experienced lower grade students can choose higher level contest. For example, primary school students with high programming skills can choose senior or intermediate or junior contest, and junior school students with strong programming skills can choose the senior contest. However high school students can't choose lower level contests.

  • Part 1 (Individual round): 5 short answer questions in 30 minutes. 1 point for each question.
  • Part 2 (Individual round): 1 programming question in 2 hours, worth 5 points.

Elementary Division (Individual written contest): 5 short answer questions in 30 minutes. 1 point for each question.

Final qualification

The top 65% of teams from the preliminary round are invited to attend the final competition

  • Each team (3 students) is allowed access to 1 computer
  • Each team can use the programming language they are most familiar with to solve the contest
  • WIFI or other internet access is not allowed during the

Elementary Division

  • Individual scores: Add 4 rounds of individual scores together
  • Team scores: The top 5 scores from a school are added together to give the team score
  • Individual scores: Add 3 rounds of individual scores together
  • Team scores: (overall individual scores + overall team scores)/ team member numbers

Elementary Division

  • No need to use a computer in the exam for Elementary Division.
National awards

Reward by different levels
Individual awards

  • Perfect Score: Get a perfect score in all the 4 rounds
  • Individual top students: top 20% individuals

Team awards

  • Gold: Top 10% teams
  • Silver: Top 25% teams
  • Bronze: Top 35% teams
  • Regional Honorable Award: Regional top 20% teams (Except for national awards)

The top teams will be invited to attend the All Star Contest in Beijing to compete for the global awards

All Star Contest

Based on cumulative team scores in each Division, top teams are invited to the All Star Contest. All Star Contest will be held on August, 2021 in Beijing. All the teams will compete in their own division.



  • Preliminary: 5th December, 2020


  • Candidates must bring their own computer for programming competition

Exam Centers

Final Exam Centers

Sample Problems


Calculators can not be used on ACSL.
If, for some reason, the student is unable to attend after paying the fee, please contact us. If you apply before the registration deadline, 25% of the registration fee will be deducted as academic materials and service fees. If you apply after the registration deadline, no refund will be given.
3. How to claim ASDAN student number?

Click here to view the claim

Northern Contact
Northern Region:
Beijing、Tianjin、Heilongjiang、Jilin、Liaoning、 Heibei、Inner Mongolia、Shanxi、Shandong
Eastern China Contact
Eastern Region:
Southern China Contact
Southern Region:
Western China Contact
Western Region:
Central China Contact
Central Region:
Central China Contact
Central Region: