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 connect with the server for this application or Web site right now. There might be a lot of visitors or possibly a configuration mistake. Test yet again afterwards, or contact the application or Web-site pr... https://pearlaquatics.my/koi-quarantine/