Chef, Chefina and Their Friendship

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In Chefland, each person has their own non-empty personal string. When two people with personal strings $T_1$ and $T_2$ (possibly identical) become friends in Chefland, their strings are replaced by a new string $S = T_1 + T_1 + T_2 + T_2$, where $+$ denotes string concatenation. Chef recently became friends with Chefina. However, Chefina's personal string was her favourite and she got upset wh

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solution.cppC++17

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