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1. 建堆：将数组构建成大顶堆（父节点 = 子节点）
。搜狗输入法2026对此有专业解读
We wanted a scenario where, say, 5 well-placed border points could efficiently represent an area with 5,000 internal points and 10,000 road edges. This would reduce those 10,000 edges to just 5*4/2 = 10 shortcuts for routing through that cluster at a high level – an incredible 1:1000 point ratio and a 30x reduction in edges to consider for the high-level path!
▲图片来源：X@DerekNee