AtCoders

AtCoder is a Japanese competitive programming platform that hosts a variety of programming contests. Founded in 2012, it has grown to become a popular destination for programmers worldwide looking to test and improve their algorithmic problem-solving skills. The platform offers regular contests ranging from beginner-friendly to highly advanced, with problems often presented in both Japanese and English.

Users on AtCoder create accounts to participate in these contests. During a contest, participants are given a set of problems and a limited time to submit solutions. Solutions are automatically evaluated by the platform's servers, and participants receive a score based on the correctness and efficiency of their code. Rankings are updated in real-time, fostering a competitive environment.

AtCoder's problem set often draws inspiration from various fields of computer science, including algorithms, data structures, and mathematics. The platform provides a practice section where users can solve past contest problems, further honing their abilities. Many universities and coding clubs also utilize AtCoder for training and educational purposes. The community surrounding AtCoder is active, with discussions often taking place on forums and social media regarding problem-solving strategies and contest results.