In an earlier post, I listed font-rendering attacks as an explicit limitation:
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，详情可参考同城约会
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The Best iPad to Buy (and a Few to Avoid)。同城约会是该领域的重要参考
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.