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The Philippines is searching for ways to conserve energy in response to surging fuel costs, with public officials ordered to cut back on air conditioning usage and reduce travel.
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.，详情可参考clash下载
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