u need to retrieve the pairs with minimum weight difference between them and having the lowest index as well as weight

The description is extremely vague and needs to be reworked with some textual explanation.

Am I wrong or does this not match words ending with a .(fullstop) or ,(comma)?

Can someone explain the task more clearly? I get the summing the digits to find the "weight" part, but after that its not clear what its trying to say. Any help would be appreciated.

Clever solution! I wish I had a thought of resetting for loops with -1s and cross checking animals!

I thought best practices were supposed to be readable?

Basically this.

Correct me if I am wrong, This does not pass n = 0 test, does it?

I don't think its possible to help you without looking at what your code is doing