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important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） Allow the opposite winner the rest of your aquatic realm, doing away with gravel hazards and preserving the pristine perfection of your respective acrylic haven. Dive into your TRUVU technique—safeguard your tan... https://pearlaquatics.my/category/aquarium-tank/page/3/