近段时间，广西柳州融安县举办多场招聘会，向求职者提供数千个就业岗位。图为2月25日，融安县招聘会现场，求职者在交流。
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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Раскрыты подробности похищения ребенка в Смоленске09:27
self.seen_urls = set()