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vital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 hook up with the server for this app or Internet site at the moment. There could possibly be a lot of targeted visitors or perhaps a configuration mistake. Check out once more later on, or Call the app or Web https://pearlaquatics.my/how-is-an-aquarium-set-up/