Hamiltonian Flights

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There are n cities and m flight connections between them. You want to travel from Syrjälä to Lehmälä so that you visit each city exactly once. How many possible routes are there? Input The first input line has two integers n and m: the number of cities and flights. The cities are numbered 1,2,\dots,n. City 1 is Syrjälä, and city n is Lehmälä. Then, there are m lines describing the flights. Each

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solution.cppC++17

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