I don't understand why this isn't the top voted solution. It's more efficient and clever than sorting.

Hello there,

I like your solution, which uses set(). I'm not really familiar with Set(). Can you explain the last line (total2 * 2 - total1), why do you need to multiply set by 2?

I've never seen you can increment i++ in the parentesis of your while loop. First, I thought it is impossible. After testing, it works like a charm. I love it and it looks more clear.

Thank you for clarifying. It's working. I should have test it correctly.

I love your approach. However, it won't work for random orders. For example: [5, 11, 12, 7, 0]