test.rb

def is_palindrome?(str)
  str.reverse == str
end

count = 0
File.open('seed.txt') do |file|
  file.each_line do |line|
    start, finish = line.split(/\s/, 2).map(&:to_i)
    (start..finish).each { |x| count += 1 if is_palindrome?(x.to_s) }
  end
end
puts count