You are given an integer array nums and you have to return a new counts array.
The counts array has the property where
the number of smaller elements to the right of
Given nums = [5, 2, 6, 1] To the right of 5 there are 2 smaller elements (2 and 1). To the right of 2 there is only 1 smaller element (1). To the right of 6 there is 1 smaller element (1). To the right of 1 there is 0 smaller element.
Return the array
[2, 1, 1, 0].
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