重要数据处理者应当建立数据标签标识等技术措施，监测、识别重要数据在不同主体之间传递的溯源链条。
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For well-distributed points, nearest neighbor search is often near O(logn)O(\log n)O(logn) in practice. In the worst case (all points clustered tightly or along a line), it can degrade to O(n)O(n)O(n), but this is uncommon with typical spatial data.
Фото: Константин Михальчевский / РИА Новости