Bus full of passengers

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There is an **empty bus** with $M$ seats and a total of $N$ people, numbered from $1$ to $N$. Everyone is currently outside the bus. You are given a sequence of $Q$ events of the following form. - $+\ i$ : It denotes that the person $i$ enters the bus. - $-\ i$ : It denotes that the person $i$ leaves the bus. It is guaranteed in the input that each person from $1$ to $N$ enters *at most* onc

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solution.cppC++17

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