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) Typical tests and adjustment of salinity levels are very important for that well-getting within your maritime daily life. Often make use of a trustworthy hydrometer or refractometer to measure salinity correctly. So... https://pearlaquatics.my/fish-pond-construction/