10 principais cp-algorithms.com concorrentes

codeforces.com

codeforces. programming competitions and contests, programming community

atcoder.jp

AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.

neetcode.io

a better way to prepare for coding interviews.

geeksforgeeks.org

Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more.

stackoverflow.com

Stack Overflow | The World’s Largest Online Community for Developers

spoj.com

SPOJ (Sphere Online Judge) is an online judge system with over 315,000 registered users and over 20000 problems. The solution to problems can be submitted in over 60 languages including C, C++, Java, Python, C#, Go, Haskell, Ocaml, and F#. SPOJ has a rapidly growing problem set/tasks available for practice 24 hours/day, including many original tasks prepared by the community of expert problem setters associated with the project.

codechef.com

CodeChef | CodeChef: Practical coding for everyone

youkn0wwho.academy

Improve your problem-solving and competitive programming skill in the most efficient way. Be a better version of yourself while having fun

clist.by

Explore our list of resources that host competitive programming contests. Discover a wide range of platforms where you can hone your skills and challenge yourself.