return ((union alloc_header *)data)[-1].length;
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Greater than: Every domino half in this space must add up to more than the number.，更多细节参见heLLoword翻译官方下载
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.