The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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Meanwhile, families of all the victims are waiting for justice. Shreeyam's mother, Karki, says she has not been able to cry.，更多细节参见safew官方下载
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Reports accuracy, pass/fail, and timing