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.
// 入栈后栈仍保持单调递增（因为小的都被弹走了）
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更多警车赶到，现场可以听到此起彼伏的警笛声。