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 trademarks are either the residence of Central Back garden & Pet Business, its subsidiaries, divisions, affiliated and/or similar firms or maybe the house of their respective house owners. 查看 時間: 全部時間 ... https://pearlaquatics.my/4-steps-to-set-up-a-sobo-fish-tank-at-your-residence/