Quadtree Search
Quadtree Search Quadtree search partitions 2D space recursively into four quadrants. Each node represents a rectangular region and stores points or subregions within that area. It is used for spatial indexing, collision detection, and range queries in two dimensions. Problem Given a set of 2D points and a query rectangle $Q$, find all points inside $Q$: $$ x_1 \le x \le x_2, \quad y_1 \le y \le y_2 $$ Structure...