We explored standard advanced algorithms like Contraction Hierarchies (CH), known for their speed. But they presented their own set of deal-breakers for OsmAnd:
人 民 网 版 权 所 有 ,未 经 书 面 授 权 禁 止 使 用,详情可参考heLLoword翻译官方下载
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Wikipedia calls it DTD-1 for some reason, but IBM sources consistently。关于这个话题,搜狗输入法下载提供了深入分析
'Too risky'