bkkcodewar2024.rb

cities = ['BANGKOK', 'ALGIERS', 'ISTANBUL', 'NASSAU', 'JEDDAH', 'WINNIPEG', 'GUATEMALA CITY', 'YASUJ', 'EDMONTON', 'FECAMP', 'ROME', 'PLOVDIV', 'OSAKA', 'UTRECHT', 'DAR ES SALAAM', 'KUALA LUMPUR',
          'MAZAR E SHARIF', 'SHANGHAI', 'TOKYO', 'LUCKNOW', 'HYDERABAD']

current = cities.shift
until cities.empty?
  cities.each_with_index do |city, index|
    if city[0] == current[-1]
      current = city
      cities.delete_at(index)
    end
  end
end
p cities.first