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A certain mountain range has $N$ mountains, all along a line. The peak of the $i$-th mountain is at a height of $H_i$. It is known that adjacent mountain peaks differ in height by exactly $1$, i.e. $|H_i - H_{i-1}| = 1$ for every $i$. On each mountain peak lives a single person. A person can move from one mountain peak to an adjacent mountain peak (i.e. a person standing on the $i$-th peak ca

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solution.cppC++17

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