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Solution: Subarrays with K Different Integers

Understand how to apply the sliding window pattern to count subarrays with exactly k distinct integers in an array. Learn to use frequency maps and two-pointer technique to efficiently track and adjust subarrays, enabling linear time complexity solutions for this common coding interview problem.

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] ...