这是外汇活动中的一种 可以从多种货币的汇率差异中，获得利润，本程序只需把汇率写入一个txt文件，即可算出能获得利润的套汇路径-activities from a variety of differences in currency exchange rates, profit, the program can be put into an exchange rate txt file, can be calculated by the arbitrage profits path