Силовые структуры
学校违反有关法律法规规定，明知发生严重的学生欺凌或者明知发生其他侵害未成年学生的犯罪，不按规定报告或者处置的，责令改正，对其直接负责的主管人员和其他直接责任人员，建议有关部门依法予以处分。
，详情可参考同城约会
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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.