// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
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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00:14, 28 февраля 2026Культура
定弹出条件：看题目要的是「第一个 / ≥ / < / ≤ cur」，对照上文的弹出条件对应法则决定弹谁。
"Anecdotally, we are seeing more patients presenting with gallstones," Hewes said.