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MTA Lab

A lab to practice arrays and hashes while traveling through a subway system.

###Prerequisites:

  • Arrays
  • Hashes

###Objectives:

  • Practice with array methods like intersection, index, etc.
  • Practice accessing items in a hash

###Activity:

  • Working in pairs, students should create a program that models a simple subway system.

  • The program takes the line and stop that a user is getting on at and the line and stop that user is getting off at and prints the total number of stops for the trip.

  • There are 3 subway lines:

    • The N line has the following stops: Times Square, 34th, 28th, 23rd, Union Square, and 8th
    • The L line has the following stops: 8th, 6th, Union Square, 3rd, and 1st
    • The 6 line has the following stops: Grand Central, 33rd, 28th, 23rd, Union Square, and Astor Place.
    • All 3 subway lines intersect at Union Square, but there are no other intersection points.
      • For example, this means the 28th stop on the N line is different than the 28th street stop on the 6 line, so you'll have to differentiate this when you name your stops in the arrays.

Sample Input/Output


***MTA***

What train do you want to get on: n, l, s? n
Which stop: ts, 34th, 28th-n, 23rd-n, us? ts

What train do you want to get off: n, l, s? s
Which stop: gc, 33rd, 28th-s, 23rd-s, us? gc


Your trip length is 8 stops.

Hints:

  • Consider diagraming the lines by sketching out the subway lines and their stops and intersection.
  • Make subway lines keys in a hash, while the values are an array of all the stops on each line.
  • The key to the lab is to find the intersection of the lines at Union Square.
  • Make sure the stops that are the same for different lines have different names (i.e. 23rd on the N and on the 6 need to be differentiated)