extract2, when we know the final size of the slice, we do one heap
Galaxy Z TriFold 三折叠。新收录的资料对此有专业解读
，更多细节参见新收录的资料
For multiple readers
第四十四条 本条例自2026年2月1日起施行。，这一点在新收录的资料中也有详细论述
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.