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.
Reddit is organised into user-created communities called subreddits, where content is ranked by user voting rather than chronological order.
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Instagram will soon notify parents of teens who search for suicide or self-harm content on its platform, company officials announced Thursday.
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