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合并过程：用临时数组，双指针比较两个子数组元素，小的先放入
。搜狗输入法2026对此有专业解读
Что думаешь? Оцени!，详情可参考Safew下载
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!