唐納德·特朗普在週二晚間發表了一場充滿戰鬥性的國情咨文報告,他宣稱美國正經歷「多年來最偉大的逆轉」(turnaround for the ages)。在民調顯示許多美國人對國家現況——以及特朗普的領導——感到不滿之際,美國總統並未透露任何改變路線的跡象。相反,他向全國進行了一場銷售推銷,對忠實支持者發出愛國號召,並嘲諷政治對手。
What if you create a truly unique routing profile that's wildly different from the common ones for which shortcuts were pre-calculated? The system is smart. If it detects that too many shortcuts (~50, for example) need on-the-fly recalculation and deviate significantly, it might determine that falling back to the original, comprehensive A* algorithm for the entire route would actually be faster than doing many small, heavily modified A* calculations.
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