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 assets of Central Back garden & Pet Corporation, its subsidiaries, divisions, affiliated and/or linked firms or perhaps the assets in their respective owners. 一天 Commemorates the tr... https://pearlaquatics.my/tips-to-follow-when-installing-a-fish-tank-malaysia/