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Grokking the Coding Interview Patterns in C#

Solution: Intersection of Two Arrays

Explore how to efficiently find the unique intersection between two integer arrays by using hash maps. This lesson teaches you to implement a dictionary-based solution that ensures each element is processed only once, reducing time complexity to linear and handling duplicates effectively.

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Statement

You are given two integer arrays, arr1 and arr2. Your task is to return a new array containing the intersection of both arrays.

  • Each element in the result must be unique.

  • The order of the elements in the result does not matter.

Constraints

  • 1≤1 \leq arr1.length, arr2.length ≤1000\leq 1000 ...