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 won't connect to the server for this app or Web-site presently. There may very well be an excessive amount of targeted visitors or even a configuration error. Test again afterwards, or Make contact with the app o... https://pearlaquatics.my/why-good-care-is-necessary-for-any-aquarium/