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 logos are possibly the assets of Central Garden & Pet Business, its subsidiaries, divisions, affiliated and/or connected companies or the home of their respective proprietors. 回復/查看 - 更高级的例子可能会演示... https://pearlaquatics.my/how-is-an-aquarium-set-up/