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CodingBat code practice

 

findTheDuplicate


Given an array, there is exactly one value that appears exactly two times. Return that value.


findTheDuplicate([1, 7, 1]) → 1
findTheDuplicate([5, 7, 5, 7, 8, 7]) → 5
findTheDuplicate([9, 9]) → 9

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int findTheDuplicate(int[] nums) { }

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