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func extract(c chan task) []task {。同城约会对此有专业解读
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代码里最“不明觉厉”的部分来了：，更多细节参见91视频
Highly Divergent Profiles: For routing configurations that are not pre-calculated as common scenarios and whose costs vary too much from default configurations, the original A* algorithm might still be faster (and is often used as an automatic fallback).
Кадр: U.S. Coast Guard