文件名称:exp3
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已知2条地铁线路，其中A为环线，B为东西向线路，线路都是双向的。经过的站点名分别如下，两条线交叉的换乘点用T1、T2表示。编写程序，任意输入两个站点名称，输出乘坐地铁最少需要经过的车站数量（含输入的起点和终点，换乘站点只计算一次）。
地铁线A（环线）经过车站：A1 A2 A3 A4 A5 A6 A7 A8 A9 T1 A10 A11 A12 A13 T2 A14 A15 A16 A17 A18
地铁线B（直线）经过车站：B1 B2 B3 B4 B5 T1 B6 B7 B8 B9 B10 T2 B11 B12 B13 B14 B15 -Known two subway lines, where A is the ring, B is the east-west lines, lines are bidirectional. After the site name are as follows, two lines cross transfer points with T1, T2 represents. Programming, site name any input two output subway station requires a minimum number of passes (including the start and end input, transfer the site only once).
Metro Line A (Link) through the station: A1 A2 A3 A4 A5 A6 A7 A8 A9 T1 A10 A11 A12 A13 T2 A14 A15 A16 A17 A18
Metro Line B (straight) through the station: B1 B2 B3 B4 B5 T1 B6 B7 B8 B9 B10 T2 B11 B12 B13 B14 B15
地铁线A（环线）经过车站：A1 A2 A3 A4 A5 A6 A7 A8 A9 T1 A10 A11 A12 A13 T2 A14 A15 A16 A17 A18
地铁线B（直线）经过车站：B1 B2 B3 B4 B5 T1 B6 B7 B8 B9 B10 T2 B11 B12 B13 B14 B15 -Known two subway lines, where A is the ring, B is the east-west lines, lines are bidirectional. After the site name are as follows, two lines cross transfer points with T1, T2 represents. Programming, site name any input two output subway station requires a minimum number of passes (including the start and end input, transfer the site only once).
Metro Line A (Link) through the station: A1 A2 A3 A4 A5 A6 A7 A8 A9 T1 A10 A11 A12 A13 T2 A14 A15 A16 A17 A18
Metro Line B (straight) through the station: B1 B2 B3 B4 B5 T1 B6 B7 B8 B9 B10 T2 B11 B12 B13 B14 B15
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exp3.cpp