用java写的套汇问题的算法，套汇问题套汇是指利用货币对率的差异,把一个单位的某种货币转换为大于一个单位的同种货币的方法。-Algorithms written in java arbitrage problem，The problem is the use of arbitrage arbitrage differences in currency rates, a currency to convert one unit greater than one unit of the same c