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Problem descriptionIf use undirected graph said freeways, with vertex said city, edge said highway between the two cities.Try to design a route program, obtain all simple paths between the two cities. The basic requirements(1) input parameters: the total number of nodes, the nodes of the city number (4 digits long Numbers, telephone area code, for example, changsha is 0731), connected to the city expressway (with high-speed highway connects the two cities of number tags).(2) input requirements take number all simple paths of the two cities.(3) will all paths (a number of city) output to the user specified file.