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） Live crops tend to be more than just ornamental components within a freshwater aquarium. They contribute to oxygenation, help preserve h2o high-quality, and supply normal habitats for fish. 9. Disputes: Apart from... https://pearlaquatics.my/author/sushant/page/6/