Given a list of London Tube stations and lines, write an application to answer the following question: What stations are N stops from East Ham? For stations with multiple routes include the station only if the minimum number of stops = N. Print out the results in alphabetical order.
For example, if N = 5, the complete answer would be:
* Bow Road
* Dagenham East
* East India
* Hackney Wick
* Leyton
* Leyton Midland Road
* Mile End
* North Greenwich
* Pudding Mill Lane
* Royal Victoria
* Stratford High Street
* Stratford International
* West Silvertown
For example, Canning Town from East Ham is possible with 4 or 5 stops, but we only consider it a valid answer for 4 stops, not 5, since we only consider the minimum number of stops.
Resources
- London Tube Map: https://tfl.gov.uk/cdn/static/cms/images/tube-map.gif
- List of Tube stations: https://www.doogal.co.uk/london_stations.php (select "Download" then "Tube line data CSV" to download a list of stations and their lines)
Requires node.js (Developed on version 7.8)
Run npm install to install dependencies.
By default, the search will start at East Ham and use 5 stops
node index.js
These params can be overridden using -s for the starting station and -n for number of stops
node index.js -s "East Ham" -n 5
Individual parms can also be supplied.
node index.js -n 16
Some results for n=5,4,16,30
Start -> East Ham ; Stops -> 5
[ 'Bow Road',
'Dagenham East',
'East India',
'Hackney Wick',
'Leyton',
'Leyton Midland Road',
'Mile End',
'North Greenwich',
'Pudding Mill Lane',
'Royal Victoria',
'Stratford High Street',
'Stratford International',
'West Silvertown' ]
Start -> East Ham ; Stops -> 4
[ 'Abbey Road',
'Bromley-by-Bow',
'Canning Town',
'Dagenham Heathway',
'Leytonstone High Road',
'Star Lane',
'Stratford' ]
Start -> East Ham ; Stops -> 16
[ 'Archway',
'Balham',
'Bayswater',
'Brondesbury',
'Earls Court',
'Hampstead',
'High Street Kensington',
'Kensal Green',
'Kilburn',
'Kilburn Park',
'Kingsbury',
'Lewisham',
'Neasden',
'Norwood Junction',
'Notting Hill Gate',
'Preston Road',
'Roding Valley',
'Royal Oak',
'Southgate',
'Warwick Avenue',
'West Brompton' ]
Start -> East Ham ; Stops -> 30
[ 'Beckenham Junction',
'Heathrow Terminal 5',
'Watford Junction' ]