Crampons, crashes and creativity: Tom Jenkins’ best photos from the Winter Olympics

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To withdraw cash, a user inserted a magnetic card that contained an account

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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"That's a pretty sacred space," he says. "We only know those things because they've let us be there."

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Жители Санкт-Петербурга устроили «крысогон»17:52