Why weird "Case X: Y" answer requirement instead of just Y?

The Digit products are a newer company in the maret, but they've already made an impression on consumers. The company's leading product is the DIGIT. It is a high-end smartphone that runs on Android and has an advanced camera with flash and other features that can be used for taking selfies or photography purposes. Everything you can collect from this https://fmshop.pl/ site.

Solution (with messy code) : https://wizmann.tk/hackerrank-digit-products-solution.html

Can anybody explain me the problem setter's code.Having trouble understanding what is dfs function and F function is doing?????????????

Digit product forum is also a good forum. Different ids can log in to it at the same time and gst billing assignments. I am sure that sharing this blog would be helpful for the readers.