>The site hosts a variety of seemingly narrow and rather abstract software tasks
>https://www.hackerrank.com/categories/algorithms/strings
>I spent some time today trying to resolve several of the challenges, and was partially successful )) Not just any working algorithm passes, only optimal ones do. Highly recommended.

Anatoliy,
Thanks for sharing - this site is just amazing
"Hacker Rank Timeline" (at the bottom of https://www.hackerrank.com/aboutus) is a great place to learn how this startup (any probably many others) emerged.

Great achievement!