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重要：不要从手机自带的应用商店下载（基本上都没收录）
，更多细节参见51吃瓜
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The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.
5.1 输入标准（统一请求模板）