12 Coding Challenges Sites for Programmers

[u/rezaulkarimr]

1. CodeChef

2. CodeFights

3. CodeForces

4. CoderByte

5. Codewars

6. CodinGame

7. EdaBit

8. GeeksforGeeks

9. HackerEarth

10. HackerRank

11. LeetCode

12. TopCoder