Fenwick trees in C++

[cs-mshah]

Description

Fenwick trees in C++ implemented with README.

Reference Issue number #468

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• New feature (non-breaking change which adds functionality)

Checklist:

• I have named my files and folder, according to this project's guidelines.
• My code follows the style guidelines of this project.
• My Pull Request has a descriptive title. (not a vague title like Update index.md)
• I have commented on my code, particularly in hard-to-understand areas.
• I have created a helpful and easy to understand README.md, with problem description and my name.
• My changes do not produce any warnings.

[cs-mshah]

@pratik-choudhari I have made the PR according to the guidelines. Please check and accept the PR. I truly enjoyed contributing to this repository and taking part in the Hacktoberfest. Got to learn a lot!!

[pratik-choudhari]

@cs-mshah Thanks a lot! It was a pleasure having you :)

[cs-mshah]

@pratik-choudhari my PR has been marked ineligible and I don't know why. The repo and the issue both have a hacktoberfest label. A previous PR on this same repo got accepted but this one is invalid.

[pratik-choudhari]

@cs-mshah Oh, that's weird. The repository is still labeled hacktoberfest.

[pratik-choudhari]

i have added another extra label let me know

[cs-mshah]

I don't think anything is possible now. They've labelled it ineligible. They haven't even put any contact so I can tell them.

[pratik-choudhari]

@cs-mshah Ohh, did you make extra PR?