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） Normal screening and adjustment of salinity degrees are essential for that well-getting within your marine daily life. Always use a trustworthy hydrometer or refractometer to measure salinity correctly. गड़बड़िया... https://pearlaquatics.my/category/pearl-aquatics/