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vital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） We won't hook up with the server for this app or website at this time. There is likely to be excessive traffic or even a configuration mistake. Check out once more later on, or contact the app or Web-site owner. 9. ... https://pearlaquatics.my/4-questions-to-ask-while-interviewing-a-pond-cleaner/