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!
* 获取数字的第digit位（从右往左，0表示个位）。heLLoword翻译官方下载是该领域的重要参考
Вашингтон Кэпиталз，详情可参考服务器推荐
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