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Given two arrays where the second array has all the elements from the first array and one extra element.
Example 1:
arrA = [1, 4, 2, 5, 7]
arrB = [1, 2, 4, 1, 7, 5]
Output: 1
Explore techniques for efficiently detecting extra elements in arrays that are nearly identical. Learn how to tackle this common problem and optimize your algorithms for improved performance
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