awesome

Hmm, arr is a pointer to a const integer, good use of arr here.

Rust translation has an incorrect reference solution. For example, if r = 6 and c = 11 then the correct expected value rounded down is -3. But Rust expects -2.

Also, Sample Tests do not compile.

In music theory, this is called an inverse interval.

is this some mathematical formula ? what's it called ?

Resolved & awaiting feedback!

Ops, thank you for the feedback & unpublishing it!
Gonna redesign and let ya know soon.
Obviously I was in a need for some rest but just pushed/pressed to get it done in hurry, my bad. Apologies for that.

Kindly check it now!

Oops, done.

There are no real tests (see my solution). I unpublished this kata. Please implement proper tests and publish again.

Did you forget to update tests? The description states that n <= 10**18 but large binary strings are tested. I prefer binary strings: The kata is much more challenging with them. So I suggest to revert the description back to the original description.

well, yeah, but it's assumed by the kata's description that the triangle is already valid + it's 8 kyu kata.
The check is reasonable to have, though

This one is missing a validation for values that exceed 180º for the sum of a and b.

• 100,000 random tests might be a bit much. What is the minimum number of random tests that you feel confident consistently times out the built-in solutions?
• Is it normal when I just return -1 the execution takes already 9 seconds?

will do, thanks

You might want to unpublish the kata for the time being.