too many loops when one-loop aproach is possible here^^

Also computationally inefficient, because each time an element gets evaluated, it is compared with all the existing lists. But I loved the functional approach.

Interesting solution, yet it is very expensive in terms of space. You are creating a new list for every range, even if it is a one value range. So in worst case you would have n lists where n is the size of the array.

best ever!