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 won't connect with the server for this application or Site right now. There might be an excessive amount traffic or possibly a configuration mistake. Try out yet again later, or Speak to the app or Web page ow... https://pearlaquatics.my/author/sushant/page/6/