Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.
int8 与 int4 — 有什么区别？，详情可参考heLLoword翻译官方下载
Jake KwonSeoul correspondent, Seoul。safew官方版本下载对此有专业解读
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