FRIENDSHIP IN WONDERLAND

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In Wonderland, everyone has their own non-empty personal string. When two people with personal strings F1 and F2 (possibly identical) become friends in wonderland,their strings are replaced by a new string S=F1+F1+F2+F2, where + denotes concatenation. Light recently became friends with Misa. But, Misa's personal string was her favourite and she got upset when it was replaced by S. She want

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solution.cppC++17

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