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 emblems are both the residence of Central Garden & Pet Company, its subsidiaries, divisions, affiliated and/or associated providers or the residence in their respective owners. ● सीधे ऐप में वीडियो बनाएं या ... https://pearlaquatics.my/what-you-must-know-before-keeping-flowerhorn-fish-in-malaysia/