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key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 with the server for this application or Site right now. There may be an excessive amount visitors or maybe a configuration error. Check out once more later on, or contact the app or Web page operator.... https://pearlaquatics.my/top-priorities-of-any-aquarium-owner/