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.
if (right - left <= 1) return; // 只有一个元素，无需排序
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Just outside the perimeter fence stand the hulking remains of grand stone engine houses, a testament to Cornwall’s proud tin and copper mining history.
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The US Space Force owns and operates the GPS constellation, providing civilian and military-grade positioning, navigation, and timing signals to cell phones, airliners, naval ships, precision munitions, and a whole lot more.