1️⃣** TopCoder**

https://www.topcoder.com/

2️⃣ Codebyte

https://coderbyte.com/

3️⃣** Project Euler**

https://projecteuler.net/

4️⃣ *Hackerrank *

https://www.hackerrank.com/

5️⃣ CodeChef

https://www.codechef.com/

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