; PROT_TESTS_PASSED — write back descriptor with Accessed bit set
Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.，详情可参考搜狗输入法下载
。搜狗输入法2026是该领域的重要参考
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Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.。关于这个话题，旺商聊官方下载提供了深入分析