The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
明知他人从事前款活动，为其提供条件的，依照前款的规定处罚。
。搜狗输入法2026对此有专业解读
You can share your location with a single contact or with a group.
if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错