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Reverse Pairs in Array | JavaScript Algorithm Tutorial | Count Reverse Pairs Efficiently
Learn how to count all reverse pairs in an integer array using JavaScript. This tutorial explains both the efficient merge sort approach (O(n log n)) and the logic behind reverse pairs where nums[i] 2 * nums[j]. Perfect for coding interviews, LeetCode problems, and algorithm practice. Example 1: [1,3,2,3,1] → Output: 2 Example 2: [2,4,3,5,1 ...
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