@manimanasamylavarapu If I am not wrong, this is a solution to this Hackerrank Problem

yes, it is also given in other places .But I haven't had that it mind.Its one of the applications of stack where to actually try to see the maximum area of histogram. But yes I understand what your are trying to say. So you can close this pull request.
Thanks.

Thank you for understanding this, What we want to create is a ready reference for well-known algorithms. If someone understands the basics they can take care about implementations on their own.