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Grokking the Coding Interview Patterns in Python

Solution: Subarrays with K Different Integers

Explore how to use the sliding window pattern to count subarrays containing exactly k distinct integers. Understand the approach of calculating subarrays with at most k and k-1 distinct integers to isolate the count, improving problem-solving efficiency in coding interviews.

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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 ...