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 won't hook up with the server for this app or Web site presently. There could possibly be a lot of website traffic or a configuration error. Try out yet again later on, or Call the application or Web page owner. ... https://pearlaquatics.my/3-things-to-remember-when-searching-for-a-fish-pond-cleaning-professional/