Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.
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，这一点在91视频中也有详细论述
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reader/sorter machine connected by serial channel to an IBM 1401 computer.
Жители Санкт-Петербурга устроили «крысогон»17:52