特朗普还称，美国要彻底摧毁伊朗海军，并已经击沉了其10艘舰艇。（央视新闻）
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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Drag out a search region below and watch the brute-force approach check every point, one by one:。Line官方版本下载是该领域的重要参考
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