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Solution: Subarrays with K Different Integers

Explore the sliding window pattern to count subarrays with exactly k distinct integers in an array. This lesson guides you through using two pointers and a frequency map to manage distinct counts efficiently. You will learn to calculate the result by finding the difference between subarrays with at most k and k minus one distinct integers, achieving a linear time solution essential for coding interviews.

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 [1,2,3][1, 2, 3]contains 33 ...