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.
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，更多细节参见搜狗输入法2026
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function mockToString(target, name) {
3. 重复步骤2直到堆大小为1