What it does
AtCoder lists programming competitions, contest results and permanent practice contests for new users and library testing.
Use the first-time-user practice contest before joining a scheduled round. It provides a bounded introduction to the contest workflow. The homepage separates upcoming, recent and permanent contests, so you can choose practice without confusing it with a live deadline. Beginner and more advanced contest series are distinct options within the same platform.
Strengths
- A permanent practice contest provides an entry point
Best for
- Learning to solve problems in a programming-contest setting
Sources
- AtCoder (Oct 26, 2026)