and the pure algorithm pseudocode is just:
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Fixing the semicircle in advance ignores configurations where the points do cluster together, just not around the chosen anchor. The real question is whether some point is a valid anchor. That is a much more generous condition.
b2: Array[float, int]
同样是做冰雪旅游，齐齐哈尔打法不同。雪地观鹤，让扎龙湿地的冬天不再沉寂。