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But the OECD warns this strength comes with growing strains. Like most countries, the Netherlands faces an ageing population, so as more people retire fewer are in the workforce.，推荐阅读WPS下载最新地址获取更多信息
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.