The current description is vague and does not clearly outline the conditions for passing.
For an 8kyu the description should be more precise to avoid confusion and for accurate understanding of the requirements.

This should be in 7kyu!

done in C

done there

Add extra task :

Can you find answer in O(1) time/memory complexity?

Using sum of Sum of an arithmetic series(progreesion)?

100%

in the examples below if n = 5, he said :

No space after the rows end

• but if you try to select the spaces after last line you can figure that out !!

Maybe it´s because you´re a 4kyu :-)

I think it was a bit to difficult for a beginner.

Enabled in this fork

OP passed the kata, closing.

A clear question formation always allows you to find the answer. In this kata, the question is completely incomprehensible and clumsy. Solved by poking

What world are you living in where this is difficult? It took me at most 5 minutes to solve this kata.

I disagree with you: why should a basic kata, which only handles multiples and simple exception cases, be classified as a 6 level?

One-line Kata)