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 to the server for this app or Web-site right now. There may be an excessive amount visitors or maybe a configuration mistake. Try out yet again later, or Speak to the application or website ow... https://pearlaquatics.my/author/sushant/page/7/