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.
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，更多细节参见爱思助手下载最新版本
incorrectly marked many unsigned 32-bit values as is_known_i32 = true.，这一点在搜狗输入法2026中也有详细论述
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