Solved issue #509

[Saurabhsahab]

Related Issue

• This is the solution of the Roy and Coin Boxes (DP) #509

Closes: #[509]

Describe the changes you've made

-I have created a directory named Roy and coin boxes in the Hackerearth directory
-In that directory the same named C++file contains solution to the problem

Mention any unusual behaviour of your code (Write NA if not)

Any unusual behaviour of your code NA

Checklist:

• My code follows the guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly whereever it was hard to understand.
• My changes generate no new warnings.

Additional Info (optional)

Any additional information you want to give