（二）已满十六周岁不满十八周岁，初次违反治安管理的；
铁路部门回应「半夜候补成功 1700 元车票作废」
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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.