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.
// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
，详情可参考safew官方下载
黎智英欺詐案上訴得直：定罪及刑罰被撤銷，出獄時間提前
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