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） All trademarks are both the property of Central Backyard garden & Pet Company, its subsidiaries, divisions, affiliated and/or connected providers or even the house in their respective owners. गड़बड़ियां ठीक की गईं, ... https://pearlaquatics.my/top-3-important-tips-for-choosing-the-new-aquarium-tank/