В Финляндии предупредили об опасном шаге ЕС против России09:28
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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材质：皮肤，决定了外观（是金属的、塑料的，还是半透明的）。
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Charities say the figures are likely to underestimate the true scale of the issue, as only those sleeping rough on one single night in the autumn are counted.