Counting MEX arrays

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The $MEX$(minimum excluded) of an array is the smallest non-negative integer that doesn't belong to the array. For instance: - The MEX of [2, 2, 1] is 0 because 0 doesn't belong to the array. - The MEX of [3,1,0,1] is 2 because 0 and 1 both appear in the array but 2 doesn't. - The MEX of [0,3,1,2] is 4 because 0, 1, 2 and 3 all appear in the array but 4 doesn't. For some array $arr_1,arr_2...arr_

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solution.cppC++17

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