agraboso made a good point, I think it would be good to state, that we are required to return the most minorized sequence possible. (or smth like that, as opposed to majorizing sequence https://en.wikipedia.org/wiki/Majorization)

Pick the first one. [1,2,3,6] comes before [1,2,4,5].

If the input was [0,1,0] 
In descending order: [1,0,0]
Sum: (1 - 0) + (0 - 0) = 1 + 0 = 1

What's the issue?

https://github.com/Codewars/codewars.com/issues/1592
https://github.com/Codewars/codewars.com/issues/1683