几个不错的coder网站

https://www.coderbyte.com/

https://projecteuler.net/about

https://www.codewars.com/

https://www.spoj.com/

https://www.codechef.com/

https://www.crunchbase.com/organization/codeeval

https://www.topcoder.com/

https://www.hackerrank.com/