Keep in mind that these websites are useful for everybody, whether you are new to coding challenges or you are a professional programmer and so on.

Contents

1. beecrowd
2. HackerRank
3. Codeforces
4. LeetCode
5. Kaggle
6. CodeChef
7. AtCoder
8. Topcoder
9. Coderbyte
10. Project Euler
11. Codewars
12. SPOJ
13. CodinGame
14. GeeksforGeeks
15. Toph
16. LightOJ
17. Exercism
18. Online Judge
19. HackerEarth
20. Code Jam - Google's Coding Competitions
21. ICPC

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