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） All logos are either the house of Central Backyard garden & Pet Corporation, its subsidiaries, divisions, affiliated and/or similar organizations or even the assets of their respective proprietors. I didn't choose to ... https://pearlaquatics.my/what-are-the-things-to-consider-when-buying-an-aquarium-for-your-office/