Highly Divergent Profiles: For routing configurations that are not pre-calculated as common scenarios and whose costs vary too much from default configurations, the original A* algorithm might still be faster (and is often used as an automatic fallback).
We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.，这一点在爱思助手下载最新版本中也有详细论述
。业内人士推荐safew官方版本下载作为进阶阅读
Екатерина Грищенко (старший редактор отдела «Бывший СССР»)
if (controller.desiredSize，更多细节参见同城约会