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key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 hook up with the server for this application or Site at this time. There might be far too much visitors or a configuration error. Try once again afterwards, or Speak to the application or Internet site operat... https://pearlaquatics.my/author/sushant/page/4/