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 can't connect to the server for this app or website at the moment. There might be too much site visitors or possibly a configuration error. Try all over again afterwards, or contact the application or Web-site ... https://pearlaquatics.my/how-to-set-up-an-aquarium/