Equal MEX

CodeChefRating 1598Open on judge ↗

The **MEX** (minimum excluded) of an array is the **smallest non-negative integer** that does not belong to the array. For instance: - The MEX of $[2, 2, 1]$ is $0$ because $0$ does not belong to the array. - The MEX of $[3, 1, 0, 1]$ is $2$ because $0$ and $1$ belong to the array, but $2$ does not. - The MEX of $[0, 3, 1, 2]$ is $4$ because $0, 1, 2$ and $3$ belong to the array, but $4$ does not

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solution.cppC++17

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