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Solution: Subarrays with K Different Integers

Explore how to solve the problem of counting subarrays containing exactly k distinct integers using a sliding window approach. Learn to use pointers and a frequency map to track unique elements, apply the difference method for counting, and understand the linear time complexity involved.

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] ...