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key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) Dwell plants are more than just ornamental aspects in the freshwater aquarium. They lead to oxygenation, aid sustain water high quality, and provide natural habitats for fish. Provided that fish can't control their sy... https://pearlaquatics.my/fish-pond-construction/