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Grokking the Coding Interview Patterns in C++

Solution: Intersection of Two Arrays

Explore how to use hash maps to find the unique intersection of two arrays efficiently. Learn the step-by-step approach that reduces complexity by tracking presence and usage of elements to build a result array with unique common elements.

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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 ...