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） Dwell vegetation are more than simply attractive aspects in a freshwater aquarium. They contribute to oxygenation, support keep drinking water quality, and provide all-natural habitats for fish. 排序: 發帖時間 一... https://pearlaquatics.my/category/aquarium-tank/page/2/