Aside from agreeing with other answers (you can't... and probably wouldn't get a good return from it)... https://www.hackerrank.com/ https://www.hackerrank.com

Aside from agreeing with other answers (you can't... and probably wouldn't get a good return from it)... https://www.hackerrank.com/ https://www.hackerrank.com/ has a lot of great algorithm challenges. They won't teach you how to do it but you need to learn the algorithms to solve the problems.