Radio 2 in the Park will take place at City Park between 7 and 9 August.
union alloc_header *h = x;h--;
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The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
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