count-of-smaller-numbers-after-self

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315. Count of Smaller Numbers After Self (Hard)

You are given an integer array nums and you have to return a new counts array. The counts array has the property where counts[i] is the number of smaller elements to the right of nums[i].

 

Example 1:

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 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.

Example 2:

Input: nums = [-1]
Output: [0]

Example 3:

Input: nums = [-1,-1]
Output: [0,0]

 

Constraints:

• 1 <= nums.length <= 105
• -104 <= nums[i] <= 104

Related Topics

[Binary Indexed Tree] [Segment Tree] [Array] [Binary Search] [Divide and Conquer] [Ordered Set] [Merge Sort]

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