For example, a 500km route might be broken down into ~100 such shortcuts. If each A* shortcut calculation explores 100-1000 detailed road segments, the total detailed segments visited by A* might be around 10,000-50,000. Compare this to the 1,000,000+ segments the old A* might have needed for the entire route!
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，更多细节参见heLLoword翻译官方下载
（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
Фото: Valentyn Ogirenko / Reuters