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） Are living crops tend to be more than simply ornamental aspects in a very freshwater aquarium. They add to oxygenation, assistance maintain h2o high-quality, and supply purely natural habitats for fish. 查看 時間: 全... https://pearlaquatics.my/author/jasun/page/2/