Personal dictionary
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
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「圍繞這些整肅的宣傳主要是對國內、對中共內部發出的訊號,暗示無論是貪腐還是未能緊跟習近平偏好,都會付出沉重代價,而這些偏好可能會隨時改變。」