Union of Two Array

Given two arrays, the task is to return their union, which consists of all distinct elements present in either array. The naive approach uses nested loops with O((n+m)^2) time complexity. The expected approach leverages a Hash Set, ensuring uniqueness with O(n+m) time complexity. The final result is the union of both arrays with no duplicates. Various methods, including using Hash Sets, are explained for efficient union computation.

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