You could achieve a lower result by taking four ones, but they are not consecutive.

The failure messages suck rocks through straws though, they add nothing and sometimes actively confuse ( by assuming what the actual problem is ).

I posted an explanation above that may be helpful. I was explaining it to myself as much as I was typing it for others, so I hope it helps anyone else even a little.

Yes.

Comment below and you will see the next post, which is a spoiler.

Fixed

My issue is not with having non-English alphabets. It is that the same code doesn't work in one version but it works in the other, even though the "working" solution should technically not be accepted.

Good observation, thanks.
Seems alright in Python.

Is the nature of length of array(odd length or even length) of any relevance?

The assumption is not a must, in my opinion.
The code should give the correct output because if two strings have the same length, their positions will remain unchanged (they will be in consecutive locations).
Not 100% sure though, please correct if I'm wrong.

You can use the section where the test cases are given. You can run test cases of your own there.
Also, keep in mind that you can check against the set test cases and the random test cases(the "Attempt" button) infinite number of times.

Duplicate of another issue

The interest is indeed given as a percentage

The triangle does not need to be stored in a variable.