Abhishek Yadav

For editorials that require some good amount of mathematical explanation, Markdown is not sufficient to explain the mathematical expressions. I think latex would be of great help there.

Added implementation of binary index tree in c++ [#1875](https://github.com/Hacktoberfest-2018/Hello-world/pull/1875)

Hey @asmeurer I would like to work on this issue. Could you please assign it to me.