Reverse Pairs - Modified Merge Sort | Java | C++ | Brute-Optimal - Explain | leetCode #493 - Hard

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Time Stamps ⏲️
0:00- 2:35 - Problem Explanation
2:36-5:50- Brute Force Approach O(n*n)
5:51- 6:48 - Brute Force Code
6:49-12:42 -Merge Sort Explain
12:42-23:21 - Modified Merge Sort with Count Explain
23:21-23:44 - Notes of Merge Sort
23:44-44:41 - Optimal Java Code
44:42-43:31 - Optimal C++ Code

Given an integer array nums, return the number of reverse pairs in the array.
Example 1:

Input: nums = [1,3,2,3,1]
Output: 2
Example 2:

Input: nums = [2,4,3,5,1]
Output: 3

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