Elevator

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Chef's apartment consists of $M$ floors (numbered $1$ through $M$), and there's an elevator that is used to move between different floors. The elevator is connected with a computer which registers its movement in a sequence $B$. Whenever the elevator moves to a different floor, the computer appends the new floor number to sequence $B$. Currently, the sequence $B$ has $N$ elements. Unfortunately

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solution.cppC++17

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