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Solution: Subarrays with K Different Integers

Understand how to use the sliding window pattern to count contiguous subarrays with exactly k distinct integers in linear time. This lesson guides you through managing a frequency map and two pointers to dynamically track subarray uniqueness, optimizing both time and space complexity.

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] ...