Crunching all these mathematical katas is very funny.

Here's a hint let both Alice and Bob play optimaly, the best way

I have solved everything except the performance test

LC translation

Does this answer your question?

Closing now.

It can be done. This in itself is a hint.

Closing.

Iterate instead of recurse, or raise the recursion limit ( not available in all languages ). Not a kata problem. Closing.

should include some examples where equation starts with a negative number. e.g. -2*3 etc.

I've marked this as a spoiler.

Approved by someone? (I'm assuming not the author since we explicitly asked for their remarks on the tests before approving).

Scala translation

The tests no longer seem to do this so I guess I'll close it.

Are leading zeroes intended to be in the random test inputs? Unless I'm missing something it shouldn't be possible for s to have a leading zero unless the actual number itself had a leading zero.