XOR Operation

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Monto likes to play with numbers. He has a list of numbers in which all numbers are occurring even times except one number. He is curious to find that number from the list. Can you help him? ###Input: - First line will contain $T$, the number of test cases. Then the test cases follow: - Each test case contains two lines of input, the First line contains $N$ the total numbers in the list. -

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solution.cppC++17

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