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） All logos are possibly the property of Central Garden & Pet Corporation, its subsidiaries, divisions, affiliated and/or relevant companies or maybe the assets in their respective house owners. Given that fish won'... https://pearlaquatics.my/author/sushant/page/5/