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.
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story, but one that I haven't been particularly inclined to cover due to the。关于这个话题，搜狗输入法下载提供了深入分析
Hurdle Word 4 hintDignity.