Chef on a trip

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Chef bought a one-way ticket from somewhere to somewhere with some changes of trains. For example: A->B B->C C->DE DE->F After he received the tickets, Unfortunately he messed up the tickets and forgot the order of the ticket. Help chef rearrange the tickets to make the tickets in correct order. Transfer trains at a city more than once doesn't make any sense. So chef will not do that. Input

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solution.cppC++17

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