Grokking Amazon Coding Interview
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Solution: Count the Number of Good Subarrays

Problem Statement

Given an array of integers nums, and an integer k, find the count of "good" subarrays within nums.

A subarray is considered "good" if it contains at least k pairs of elements (i, j) where i < j and nums[i] == nums[j].

A subarray is a contiguous sequence of elements in the original array.

Examples

  • Example 1:
    • Input: nums = [2, 2, 2, 3, 3], k = 3
    • Expected Output: 3
    • Justification: There are 3 good subarrays that meet the criteria: [2, 2, 2, 3], [2, 2, 2, 3, 3], and [2, 2, 2]

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