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） With Zoom Earth you are able to monitor the development of hurricanes and storms, check wildfires and smoke, and keep mindful of the newest ailments by viewing satellite imagery and rain radar current in in the vici... https://pearlaquatics.my/author/sushant/page/9/