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critical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 connect with the server for this application or Web-site presently. There is likely to be far too much traffic or simply a configuration mistake. Try out once more later, or contact the application or Si... https://pearlaquatics.my/how-to-build-a-fish-pond-at-a-commercial-property/