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.
savings account, where transactions were so infrequent that the bank recorded
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
定方向：求「下一个」→ 倒序；求「上一个」→ 正序。