Transport for London helpfully provides visitors with a map that shows walking times between stations on the London Underground: see http://content.tfl.gov.uk/walking-tube-map.pdf. Suppose you are doing research for a book on the architecture of Underground stations, and your task for today requires you to walk from Tottenham Court Road to Kings Cross St Pancras, following the routes of the Underground lines to ensure you walk past each station on your chosen route. You may take whichever route you prefer, and for the purposes of this question it is assumed you favour the fastest route. When answering parts (c) and (d) below, you should briefly describe each algorithm and show the contents