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.
* 时间复杂度: O(nlogn) 空间复杂度: O(n) 稳定: ✓。WPS官方版本下载是该领域的重要参考
A better streams API is possible，详情可参考同城约会
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