Flight controllers at Nasa working out how to get the crippled Apollo 13 back to Earth.
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The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.，推荐阅读搜狗输入法2026获取更多信息