const sp = speed[i];
The answer: OsmAnd's custom-built Highway Hierarchy (HH) Routing. This isn't your standard routing engine; it's a ground-up redesign, meticulously engineered to overcome the unique challenges of providing advanced navigation on compact, offline-first map data.,这一点在旺商聊官方下载中也有详细论述
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// block: Wait for space (unbounded pending queue)