Chef and Periodic Sequence

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Let's define a periodic infinite sequence $S$ ($0$-indexed) with period $K$ using the formula $S_i = (i \% K) + 1$. Chef has found a sequence of positive integers $A$ with length $N$ buried underground. He suspects that it is a contiguous subsequence of some periodic sequence. Unfortunately, some elements of $A$ are unreadable. Can you tell Chef the longest possible period $K$ of an infinite peri

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solution.cppC++17

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