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） Reside plants are more than just ornamental things in the freshwater aquarium. They contribute to oxygenation, enable maintain h2o excellent, and provide organic habitats for fish. 排序: 發帖時間 , 17/twelve/2024 Co... https://pearlaquatics.my/how-to-maintain-a-small-fish-tank/