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.
this.arr = []; // 存储所有历史价格，通过索引快速获取对应价格，更多细节参见Line官方版本下载
，这一点在heLLoword翻译官方下载中也有详细论述
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// Hypothetical compression API...