实现一个销售网络扩张后A、B 分店所在城市分布查询系统，用命令行执行。从data1.txt读入，输出到result1.txt（详见内附说明）-achieve a sales network expansion after the A, B outlets for the host city distribution system, with command-line implementation. Data1.txt read from the output of result1.txt (se