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 can keep track of the event of hurricanes and storms, keep an eye on wildfires and smoke, and remain mindful of the most recent problems by viewing satellite imagery and rain radar up-to-date i... https://pearlaquatics.my/author/jasun/page/2/