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critical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 crops tend to be more than just ornamental components within a freshwater aquarium. They lead to oxygenation, enable preserve h2o high-quality, and provide purely natural habitats for fish. 兩天 回復/查看 As... https://pearlaquatics.my/product/sobo4x1-5x2-5/