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crucial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 testing and adjustment of salinity ranges are critical for that properly-being of one's marine life. Normally use a reliable hydrometer or refractometer to evaluate salinity precisely. I didn't choose to go... https://pearlaquatics.my/what-can-you-buy-from-an-aquarium-shop/