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class Sanjiao
                def initialize(row)
                        @row = row
                end
                def sanjiaoxing(temp)
                number = temp.length
               temp.each do |x|
                                    print x.to_s+' '
                             end
            array = Array.new(number.to_i+1)
                             0.upto(number.to_i) do |x|
                     if x == 0                 #  两端的就不用求了，
                                                         array[0] =1
                                       elsif  x == number.to_i
                             array[number.to_i] = 1
                     else
                                             array[x]=temp[x-1].to_i+temp[x].to_i    #根据上一个数组的结果得下一数组的值
                                   end
                             end
                                temp = array   #hauncunyixia
                             puts " "
               if number.to_i < @row
                                 sanjiaoxing(temp)
               end
                end
end

temp = Array.new(1)
temp[0] =1
p = Sanjiao.new(20)
p.sanjiaoxing(temp)