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The values 0, [], "", False and None are falsy in a boolean expression, in this case if new_plan means len(new_plan) != 0.

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.

Find the area of the shape, seems simple enough.

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