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 trademarks are possibly the residence of Central Yard & Pet Corporation, its subsidiaries, divisions, affiliated and/or relevant firms or even the property in their respective entrepreneurs. 一天 , seventeen/twelv... https://pearlaquatics.my/fish-pond-building-services/