The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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NASA wrote a statement saying that the astronaut experienced an unknown medical event on January 7 "that required immediate attention" from his fellow crew members. Fincke added that his "status quickly stabilized" thanks to the "quick response and the guidance" of the flight surgeons.
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