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crucial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） Enable the opposite winner the rest of your aquatic realm, eradicating gravel risks and preserving the pristine perfection of your respective acrylic haven. Dive into the TRUVU approach—safeguard your tank, banish... https://pearlaquatics.my/what-kind-of-services-facilities-you-can-receive-from-an-online-aquarium-shop/