Chef and numbers part 2

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Chef has given you a array of numbers , In this array every numer appears 2 times except one. Your task is to find that exceptionla number. Input : First line contain number of t test cases , the next following t-lines contains N - number of elements next line contain n spaced numbers Output : For each test case print the exceptional number in new line. Constraints: 1 T n a[i] Exa

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solution.cppC++17

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