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Solution: Subarrays with K Different Integers

Understand how to use the sliding window pattern combined with a frequency map to count subarrays containing exactly k distinct integers in linear time. This lesson guides you through expanding and shrinking the window to maintain distinct element constraints, helping you develop efficient array manipulation skills 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] ...