ravikumar-n

class Polynomial
  def initialize(coefficients)
    raise ArgumentError, "Need at least 2 coefficients" if coefficients.size < 2 
    @co = coefficients
    @powers = Array.new(@co.size - 2) { |i| "x^#{i+2}"}.reverse << 'x' << nil
  end

  def to_s
    return "0" if @co.all? { |c| c.zero? } # not much to do in this case
    @co.zip(@powers).map do |el|