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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.
很多人不喜欢用手机原相机拍照,总觉得它拍出来的照片太无聊,色彩平淡且数码感强烈,这是计算摄影诟病已久的问题。但其实各大手机厂商这两年都在悄悄改变,藏在原相机深处的功能,有不少可以挖掘的宝藏。
// It is a promise that, when resolves, indicates that