Announcement of Winning Schools and Individuals for 'AtCoder Junior League 2025 Winter', an Inter-School Competitive Programming League for Junior and Senior High Students
AtCoder Inc. has announced the winning schools and individuals for the 'AtCoder Junior League 2025 Winter', a competitive programming tournament for junior and senior high school students in Japan, which saw participation from 598 students.
📋 Article Processing Timeline
- 📰 Published: April 22, 2026 at 22:00
- 🔍 Collected: April 23, 2026 at 00:02 (2h 2m after Published)
- 🤖 AI Analyzed: April 23, 2026 at 06:31 (6h 29m after Collected)
AtCoder Inc. (Headquarters: Shinjuku-ku, Tokyo / CEO: Naohiro Takahashi, hereafter AtCoder) announces that it has determined the winning schools and individuals for the 'AtCoder Junior League 2025 Winter', an inter-school competitive programming league for junior and senior high school students residing in Japan.
AtCoder Junior League 2025 Winter Page: https://atcoder.jp/contests/ajl2025winter
■ What is AtCoder Junior League 2025 Winter?
The AtCoder Junior League is an inter-school league tournament for junior and senior high school students hosted by AtCoder. It consists of an Algorithm Division, where rankings are competed based on scores calculated from performances in the AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Grand Contest (AGC), and a Heuristic Division, based on performances in the AtCoder Heuristic Contest (AHC).
AtCoder Junior League 2025 Winter was held from October 2025 to March 2026, with a total of 598 participants registered: 147 students from 63 junior high schools and 451 students from 168 high schools.
AtCoder will present certificates and commemorative gifts to the top 20 junior high and high schools, as well as the top 20 individuals in each junior high and high school grade for the Algorithm Division. For the Heuristic Division, the top 10 junior high and high schools, and the top 10 individuals in each grade will be awarded.
Through the AtCoder Junior League, AtCoder aims to spread competitive programming in junior high and high schools by letting students nationwide discover the joy and appeal of competitive programming, and by creating an environment where participants can interact and influence each other like in a club activity.
■ List of Winning Schools and Individuals
[Omitted in the source text]
■ Voices of the Winners
"It was very fun to compete with people of the same age and similar skill levels. My rank was at the bottom among the winners, but I am very happy to have won an award. Next time, I want to work even harder and aim for a higher rank!" (AtCoder User ID: kirameku)
"I am happy to receive the school award! I couldn't get a very good result individually, but I want to do my best in the next Junior League!" (AtCoder User ID: econan)
"I am relieved to have achieved my goal of getting 1st place. Sacrificing all my available time to participate in the long-term heuristic contest was worth it. The tension of not gaining any score if I dropped below 2200 performance was intense. I will continue to do my best. If I were to be greedy, I'd want to reach the bronze crown!" (AtCoder User ID: imoken_p)
■ Rules of AtCoder Junior League 2025 Winter
● Eligibility
- 1st and 2nd-year students of junior high schools, high schools, colleges of technology, and specialized training colleges residing in Japan and belonging to schools listed in the Ministry of Education, Culture, Sports, Science and Technology (MEXT) school code as of October 2025.
MEXT School Code: https://www.mext.go.jp/b_menu/toukei/mext_01087.html
● Score Calculation Method
- Individual scores are calculated based on the performance in AtCoder contests (ABC, ARC, AGC, AHC) participated in by registered junior/senior high students.
- The school score is calculated as the sum of the individual scores of all registered participants belonging to that school.
■ AtCoder Junior League 2026 Summer Now Being Held
We are currently holding the AtCoder Junior League 2026 Summer! We look forward to your registration.
AtCoder Junior League 2026 Summer Page
AtCoder Junior League 2025 Winter Page: https://atcoder.jp/contests/ajl2025winter
■ What is AtCoder Junior League 2025 Winter?
The AtCoder Junior League is an inter-school league tournament for junior and senior high school students hosted by AtCoder. It consists of an Algorithm Division, where rankings are competed based on scores calculated from performances in the AtCoder Beginner Contest (ABC), AtCoder Regular Contest (ARC), and AtCoder Grand Contest (AGC), and a Heuristic Division, based on performances in the AtCoder Heuristic Contest (AHC).
AtCoder Junior League 2025 Winter was held from October 2025 to March 2026, with a total of 598 participants registered: 147 students from 63 junior high schools and 451 students from 168 high schools.
AtCoder will present certificates and commemorative gifts to the top 20 junior high and high schools, as well as the top 20 individuals in each junior high and high school grade for the Algorithm Division. For the Heuristic Division, the top 10 junior high and high schools, and the top 10 individuals in each grade will be awarded.
Through the AtCoder Junior League, AtCoder aims to spread competitive programming in junior high and high schools by letting students nationwide discover the joy and appeal of competitive programming, and by creating an environment where participants can interact and influence each other like in a club activity.
■ List of Winning Schools and Individuals
[Omitted in the source text]
■ Voices of the Winners
"It was very fun to compete with people of the same age and similar skill levels. My rank was at the bottom among the winners, but I am very happy to have won an award. Next time, I want to work even harder and aim for a higher rank!" (AtCoder User ID: kirameku)
"I am happy to receive the school award! I couldn't get a very good result individually, but I want to do my best in the next Junior League!" (AtCoder User ID: econan)
"I am relieved to have achieved my goal of getting 1st place. Sacrificing all my available time to participate in the long-term heuristic contest was worth it. The tension of not gaining any score if I dropped below 2200 performance was intense. I will continue to do my best. If I were to be greedy, I'd want to reach the bronze crown!" (AtCoder User ID: imoken_p)
■ Rules of AtCoder Junior League 2025 Winter
● Eligibility
- 1st and 2nd-year students of junior high schools, high schools, colleges of technology, and specialized training colleges residing in Japan and belonging to schools listed in the Ministry of Education, Culture, Sports, Science and Technology (MEXT) school code as of October 2025.
MEXT School Code: https://www.mext.go.jp/b_menu/toukei/mext_01087.html
● Score Calculation Method
- Individual scores are calculated based on the performance in AtCoder contests (ABC, ARC, AGC, AHC) participated in by registered junior/senior high students.
- The school score is calculated as the sum of the individual scores of all registered participants belonging to that school.
■ AtCoder Junior League 2026 Summer Now Being Held
We are currently holding the AtCoder Junior League 2026 Summer! We look forward to your registration.
AtCoder Junior League 2026 Summer Page