The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
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NAPA, Calif. -- In the immortal words of song developer Pete Townshend, "Well, who are you? (Who are you? Who, who, who, who?) I really wanna know!" Linux kernel maintainers have the same question: Who are their programmers, and how can the kernel community be sure the code they submit is really theirs?
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再加上市场开放之后，中国消费者的出游习惯与偏好又在发生巨变，更看重情绪价值和个性化体验，旅行的每一分花费，必须得是超值的，才能笼络他们的心。市场竞争环境那也是翻天覆地，这让价格相对更高的“招商伊敦”号也一直活得很拧巴。