Compress the List

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You are given a strictly increasing sequence of integers $A_1, A_2, \ldots, A_N$. Your task is to compress this sequence. The *compressed form* of this sequence is a sequence of ranges separated by commas (characters ','). A *range* is either an integer or a pair of integers separated by three dots (the string `"..."`). When each range `a...b` in the compressed form is decompressed into the sub

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solution.cppC++17

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