Commuter Trains

The manager of Sants station has designed a system for assigning
arriving commuter trains to the station’s tracks. There are four
commuter rail lines, 1, 2, 3, and 4, and two possible directions: ”N”
(north) and ”S” (south). The track assignments are as follows. For line
1, northbound trains use track 8 and southbound trains use track 7. For
line 2, the tracks are 10 (north) and 9 (south). For line 3, the tracks
are 12 (north) and 13 (south). Finally, for line 4, the tracks are 14
(north) and 15 (south).

Design the function cercanias(linea,sentido), which takes a positive
integer linea representing the commuter rail line and a character
sentido indicating the direction (”N” for north and ”S” for south), and
returns the corresponding track number. If the line or direction is
invalid, the function must return 0.

Sample session

Problem information

Author: Unknown
Translator: infbesos

Generation: 2026-10-13T21:52:46.939Z

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