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) Reside plants tend to be more than simply ornamental things in a very freshwater aquarium. They add to oxygenation, assistance manage h2o excellent, and supply organic habitats for fish. One thing I do once I get... https://pearlaquatics.my/author/jasun/