mark candidate[n] as used
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。关于这个话题，同城约会提供了深入分析
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.
Shreeyam Chaulagain's mother did not want him to go.
（三）国务院财政、税务主管部门规定的其他情形。