codility-ruby/Lesson_004_PermCheck.rb at master · vspar/codility-ruby · GitHub

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class PermCheck

  def self.solution(a)
    complete = (1..a.length).to_a
    return 1 if (complete - a).empty?
    return 0
  end

end

result = PermCheck.solution([4, 1, 3, 2])
puts "#{result}, pass: #{result == 1}"

result = PermCheck.solution([4, 1, 3])
puts "#{result}, pass: #{result == 0}"

# TESTED AND PASSED ON Codility