再用n2的时间（两重循环）枚举d-c，并将b-c的值作为键，在Hash数组中查找是否存在。如果能找到crucial相同的node点，则找到了一组满足 D-c = a+b的值。（注意检查a b c d 四个数不重复） Standard tests and adjustment of salinity degrees are vital for the effectively-becoming within your maritime daily life. Generally utilize a reliable hydrometer or refractometer to measure salinity accurately. 查... https://pearlaquatics.my/category/pearl-aquatics/page/5/