https://www.interviewstreet.com/challenges/dashboard/#problem/4edb8abd7cacd

string_similarities.rb

# Enter your code here. Read input from STDIN. Print output to STDOUT
N = gets.to_i
words = []

while words.length < N do
  words << gets.sub(/\\n$/, '').strip
end 
    
words.each do |word|
  count = 0
  (word.length).times do |i|
    sub = word[i..-1]
    j=0
    while j < sub.length && sub[j] == word[j] do
      count += 1 
      j+=1
    end
  end
  puts count
end