Now, OsmAnd performs another Dijkstra search, but this time on the much smaller "base graph." This graph consists only of the border points and the pre-calculated shortcut values between them.
SelectWhat's included，推荐阅读搜狗输入法下载获取更多信息
。关于这个话题，safew官方下载提供了深入分析
environment captures the function's free variables at the point of definition.，更多细节参见爱思助手
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