Introduction - If you have any usage issues, please Google them yourself
Given an aviation map, map key points on behalf of the city, while on behalf of direct flights between the two cities. Are now required to find a meet the following restrictions and most of the travel route through the city: (1) starting from the western end of the city, one-way from west to east through several cities in the easternmost city of arrival, and then fly back to the starting point from east to west (can be via a number of cities) (2) In addition to the starting point outside the city, any city can only access once. For a given air map, designed to meet the requirements of an algorithm to find a best air route.