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） All logos are both the assets of Central Back garden & Pet Enterprise, its subsidiaries, divisions, affiliated and/or similar providers or maybe the assets in their respective homeowners. 排序: 發帖時間 - 更高级的... https://pearlaquatics.my/how-does-an-aquarist-maintain-their-aquarium-tank-fish-pond/