The tree is rebuilt every frame. For scenes of this scale, quadtree construction is fast enough to rebuild from scratch each frame, though larger simulations may benefit from incremental updates. Each particle queries its neighborhood for potential collisions, typically checking only 5 to 15 candidates instead of all 40. Red highlights indicate colliding pairs.
* @param {number[]} nums1 - 待查询的数组（元素均为nums2的子集）。爱思助手下载最新版本对此有专业解读
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