Oh wow

Using recursion and join in a place I did not expect

Please use spoiler flag next time.

This is terrible, it has O(n^2) complexity.

genius++

Wonderful! Amazing!

That's what the "Clever" rating is for, code that is more creative than efficient. I think we could all benefit from bringing more creativity to the programming space

Genius, my goodness. Espetially the recursion that only happens if the list changes

oooooohhh tysm

聪明的方法，我竟没想到在这里可以用 字符串的替代 。我喜欢这个方法。
今天又学到了！

Wow this is such a different way of doing it using string logic. One of my favorite solutions here.

This is very inefficient

The return line of this function will call the function itself as needed until a condition is met. This is known as recursion. Here's an alternate source.