3

Challenge
Given a non-empty array of integers, e.g.:
[5, 2, 7, 6, 4, 1, 3]
First sever it into arrays where no item is larger than the previous (i.e. non-ascending arrays):
[5, 2] [7, 6, 4, 1] [3]
Next, reverse each array:
[2, 5] [1, 4, 6, 7] [3]
Finally, concatenate them all together:
...