* @return {string} 移除k位后最小的数字（字符串形式）
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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.
revocability and the presence of ATMs under bank surveillance) to be relatively