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 emblems are both the residence of Central Backyard garden & Pet Business, its subsidiaries, divisions, affiliated and/or related companies or maybe the property in their respective homeowners. 一個月 - 更高级的例... https://pearlaquatics.my/tag/maintenance-tips/