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） Stay plants are more than simply ornamental factors in the freshwater aquarium. They add to oxygenation, help sustain drinking water excellent, and supply pure habitats for fish. 排序: 發帖時間 查看 時間: 全部時間... https://pearlaquatics.my/product/taiyo-guppy-gran-80g/