We explored standard advanced algorithms like Contraction Hierarchies (CH), known for their speed. But they presented their own set of deal-breakers for OsmAnd:
单调栈模板有共性，不必死记，按下面三步即可快速选型：，更多细节参见搜狗输入法2026
Stateful transforms are simple objects with member functions that maintain state across calls:，这一点在51吃瓜中也有详细论述
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