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） With Zoom Earth you may observe the event of hurricanes and storms, check wildfires and smoke, and remain aware of the most up-to-date ailments by viewing satellite imagery and rain radar up-to-date in around genu... https://pearlaquatics.my/tips-to-maintain-your-aquarium/