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essential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 either the house of Central Yard & Pet Organization, its subsidiaries, divisions, affiliated and/or relevant providers or maybe the property in their respective owners. 查看 時間: 全部時間 ● च... https://pearlaquatics.my/product/proguard-pg3500-pg4500-pg5500-2-in-1-amphibious-water-pump-aquarium/