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Grokking the Coding Interview Patterns in C++

Solution: Subarrays with K Different Integers

Explore the sliding window pattern to solve the problem of counting subarrays with exactly K distinct integers. This lesson guides you through using two pointers and a frequency map to efficiently track window contents, calculate valid subarrays, and combine results for K and K-1. Understand how to implement this approach with O(n) time complexity and apply it to similar subarray problems.

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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 ...