Yet Another Mex Problem

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*Nayra doesn't like stories of people receiving random arrays as birthday presents, but this time she received random arrays as presents for her own birthday! After struggling for a day trying to figure out what to do with the array, she asked Aryan for help. He gave her the following problem.* Given $3$ integers $N, P,$ and $M$. - Let $f(A)$ be the [MEX](https://en.wikipedia.org/wiki/Mex_(mathem

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solution.cppC++17

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