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 emblems are possibly the house of Central Backyard garden & Pet Business, its subsidiaries, divisions, affiliated and/or linked organizations or perhaps the property of their respective house owners. चैनल की पैस... https://pearlaquatics.my/tips-to-maintain-your-aquarium/