Alice and Mex

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Alice has known the concept of MEX (Maximum excluded), which represents the minimum non-negative integer that does not belong to the array. For instance: - The MEX of [2,3,1,4] is 0 because 0 does not belong to the array. - The MEX of [1,1,0,2,2] is 3 because 3 does not belong to the array. Bob challenges Alice and gives him an array $A$ of length N and the task is to count the number of subarra

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solution.cppC++17

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