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 website right now. There might be excessive site visitors or maybe a configuration mistake. Try out all over again later, or Speak to the application or... https://pearlaquatics.my/author/sushant/page/6/