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whatalnk/abc109-b.rb

Created September 9, 2018 05:57
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AtCoder ABC #109 B
Raw
abc109-b.rb
n = gets.chomp.to_i
words = Hash.new(0)
prev = ""
n.times do |i|
w = gets.chomp
if i == 0
prev = w
else
if words.has_key?(w)
puts "No"
exit
elsif prev[-1] != w[0]
puts "No"
exit
else
prev = w
end
end
words[w] += 1
end
puts "Yes"
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