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Grokking the Coding Interview Patterns in JavaScript

Solution: Intersection of Two Arrays II

Understand how to apply hash maps to solve the Intersection of Two Arrays II problem by counting element frequencies in one array and matching elements from the second. Learn to implement an efficient solution that correctly handles duplicate elements and optimize time and space complexity.

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Statement

Given two integer arrays nums1 and nums2, return an array representing their intersection. Each element in the result should appear exactly as many times as it appears in both arrays. The result may be returned in any order.

Constraints:

  • 1≤1 \leq nums1.length, nums2.length ≤1000\leq 1000 ...