<ul><li>Given two permutations nums1 and nums2 of length n, find the total number of good triplets.</li><li>A good triplet consists of 3 distinct values in increasing order in both arrays.</li><li>Precompute positions of elements in both arrays and create element structures.</li><li>Calculate left count of elements before each element using Fenwick Tree.</li><li>Calculate right count of elements after each element using reverse Fenwick Tree.</li><li>Combine left and right counts to get the total number of good triplets.</li><li>Implementation provided using PHP with a class for Fenwick Tree and the main function.</li><li>Use of Fenwick Tree allows efficient counting of elements for the solution.</li><li>The approach results in O(n log n) time complexity suitable for large inputs.</li><li>Overall, the method efficiently counts good triplets in permutations using data structures.</li></ul>

2179. Count Good Triplets in an Array

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