AIZU ONLINE JUDGE～Programming Learning／Online Programming Judge System

"Aizu Online Judge (AOJ)" is an online programming judge system. You can improve your programming skills using AOJ!
AOJ is a web-based learning support system that allows programmers to submit their code for automated evaluation and grading.
The University of Aizu has been developing and operating AOJ for over 15 years, and it has attracted over 120,000 registered users. It has been widely utilized by numerous individuals and organizations. From an introduction to programming to advanced techniques in algorithms and data structures, you can enhance your programming skills by solving problems that are appropriate for your proficiency level. You can also challenge yourself with problems that have been featured in competitions such as the High School Information Olympiad, “PC Koshien”, and the International Collegiate Programming Contest (ICPC). It is highly recommended for those who want to start programming or improve their skills.