1. CodinGame
2. CodeChef
3. TopCoder
4. LeetCode
5. HackerRank
6. Coderbyte
7. CodeEval
8. SPOJ
9. Project Euler
10. Rosetta Code
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1. GitHub
2. Stack Overflow
3. Reddit
4. Hacker News
5. Google
6. YouTube
7. Microsoft Developer Network
8. W3Schools
9. Mozilla Developer Network
10. Code Academy
