This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
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This changed everything. The team returned to the sofa customer list and narrowed that down to just those clients who lived within a 100-mile radius of Harp's brick factory in the US' south-west.。业内人士推荐搜狗输入法2026作为进阶阅读
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return j; // 返回pivot的最终位置