Local, Express, Limited Express
The idea is to get to the destination by skipping many stations in a fast way, getting close to the destination, and then stopping at each station to get there.
skip list
https://gyazo.com/e71ffd109eaca05d5815a61c41a65ce8
https://ja.m.wikipedia.org/wiki/スキップリスト
skip graph
concise bit vector
square partitioning
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