At capacity 1, every point gets its own cell, and the tree subdivides as deeply as possible. At capacity 10, many points coexist in the same node, and the tree stays shallow.
can reuse the array when ((union alloc_header *)data)[-1].ref is zero.。WPS官方版本下载对此有专业解读
Natural Neighbour Interpolation，这一点在搜狗输入法2026中也有详细论述
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