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This is in-place but I am not sure what the time complexity is.

Amazing.

Wow, this submission really tripped me up. I had to use a visualizer to see what was being done. Very clever.

So..when we hit the recursive function, it returns the sum and the sum turns into a key. We are sorting by values, is this turning them into tuples? I'm lost.

Thanks, very readable.

Brilliant. My brute force solution was so hideous in comparison. Timed out and wouldn't accept. This solution is much more concise. I'm learning.

Very readable. I was so close :( . why the need for semi-colons though?

Nice.

Very interesting question. I'll have to come back to this.

No, I believe they just mean to do a bunch of 7kyu questions to prepare for their interviews. If you level down that's great. Try to do about 15-20 7kyu.

oooooo okay, now I understand. Arigato!

I came from codefights for a better description. However, I still do not understand what is being asked.