If you need only to compute the distance and not alignments, as is usually the case, it is easy to reduce this to o (n), since only the previous row is required to compute the next.
如果您只需要计算距离，不需要校准，就像通常情况那样，那么可以很容易地把空间需求降到O (n)，因为计算下一行只需要前面一行。
As the Citro? N accelerated southward across the city, the illuminated profile of the Eiffel Tower appeared, shooting skyward in the distance to the right.
雪铁龙继续加速向南穿越城区。这时被照亮的埃菲尔铁塔的轮廓开始显现出来。在车右边铁塔直插云霄。
As the Citro? N accelerated southward across the city, the illuminated profile of the Eiffel Tower appeared, shooting skyward in the distance to the right.
雪铁龙继续加速向南穿越城区。这时被照亮的埃菲尔铁塔的轮廓开始显现出来。在车右边铁塔直插云霄。
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