Receipt Recovery

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While vacationing in Egypt, Chef found a recipe of an ancient dish. The receipt is a sequence of hieroglyphs written on a magic paper - it survived for thousands of years! The sequence is written on a long scroll. Unfortunately, the scroll is split into pieces, and possibly, some pieces of the scroll are missing. Chef has a total of N pieces, numbered for convenience from 1 to N. He gave the piece

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solution.cppC++17

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