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critical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 connect with the server for this application or Web page right now. There may be too much targeted traffic or a configuration mistake. Attempt yet again later, or Call the app or Web page proprietor. ... https://pearlaquatics.my/what-should-be-your-first-steps-to-set-up-an-aquarium/