最佳销售员 某售货员要到若干城市去推销商品，他要选定一条从驻地出发，经过每个城市一遍，最后回到驻地的路线，使总的路程最小。-The best salesman a salesman to several city to sell goods, he shall select a start from the station, after every city again, and finally return to the home of route, the total distance mi