<ul><li>Given an integer array nums and an integer k, return the number of good subarrays of nums.</li><li>A subarray arr is good if there are at least k pairs of indices (i, j) such that i < j and arr[i] == arr[j].</li><li>The approach to solve this problem efficiently involves using a sliding window technique combined with a hash map to track the frequency of elements within the current window.</li><li>This approach efficiently counts all valid subarrays in linear time, O(n), by ensuring each element is processed at most twice (once added and once removed from the window).</li></ul>

2537. Count the Number of Good Subarrays

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