Given an integer array nums, return an integer array counts where counts[i] is the number of smaller elements to the right of nums[i].
- An integer array
nums.
Input: nums = [5, 2, 6, 1]
Output: [2, 1, 1, 0]
Explanation:
- To the right of 5, there are 2 smaller elements: 2 and 1.
- To the right of 2, there is 1 smaller element: 1.
- To the right of 6, there is 1 smaller element: 1.
- To the right of 1, there are 0 smaller elements.