A Tale of Two Strings

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Two strings can be shuffled by interspersing their letters to form a new string, much like two piles of cards can be shuffled to form a single pile. For example, the strings HELLO and WORLD can be shuffled to form HWEOLRLLOD, or HEWORLLLDO, or perhaps simply HELLOWORLD. It is not a shuffle if the original order of letters is not preserved. For example, the D in WORLD cannot ever appear before the

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solution.cppC++17

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