routing - find rout from a to b -

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i want find rout b using public transport. suppose i'm found path b(i.e. sequence stops b), how create route(i.e. go d on bus 3, take bus 15 d b)? use depth first method, create graph connecting stops transport (considering connecting length).

annotate each direct connection (i.e. edge in graph of transportation map) between 2 stops bus lines serve part of connection. traverse path , select of bus lines first edge. every time, recent bus line selection not available on next edge, need change busses. might want backtracking in order find connection least stops.


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