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Subarrays with K Different Integers

Explore how to efficiently count subarrays with exactly k distinct integers by mastering the sliding window approach. Understand problem constraints, how to identify good subarrays, and apply this pattern to coding interview problems.

Statement

You are given an integer array nums and an integer k. Your task is to return the number of good subarrays of nums.

A good subarray is a contiguous subarray that contains exactly k distinct integers. For example, in the array [1,2,3,1,2][1, 2, 3, 1, 2], the subarray ...