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） We will not hook up with the server for this app or Internet site right now. There might be a lot of website traffic or a configuration error. Consider all over again afterwards, or Call the application or Web-sit... https://pearlaquatics.my/product/api-quick-start/