def insertSort(tarray)
  i=1
  while(i < tarray.size) do
   if tarray[i] < tarray[i-1]
     j=i-1
     x=tarray[i]
   #puts x.class
   #puts tarray[i].class
     tarray[i]=tarray[i-1]#先與左側第一個比自己大的交換位置
     while(x< tarray[j].to_i) do#尋找到一個比自己小的，并放在其后
      tarray[j+1]=tarray[j]
      #puts tarray[j].class
      j=j-1
     end
     tarray[j+1]=x
   end
   i=i+1
  end
 end

a=[5,2,6,4,7,9,8]
insertSort(a)
print a

[2, 4, 5, 6, 7, 8, 9]>Exit code: 0

final.rb:10:in `<': comparison of Fixnum with nil failed (ArgumentError)

def two_way_sort data
 first,final = 0,0
 temp = []
 temp[0] = data[0]
 result = []
 len = data.length

 for i in 1..(len-1)
  if data[i]>=temp[final]
   final +=1
   temp[final] = data[i]
  elsif data[i]<= temp[first]
   first = (first -1 + len)%len
   temp[first] = data[i]
  else
   if data[i]<temp[0]
    low = first
    high = len -1
   
    while low <=high do
     m = (low + high)>>1
     if data[i]>temp[m]
      low = m + 1
     else
      high = m -1
     end
    end
    
    j = first - 1
    first -=1
    while j < high do
     temp[j] = temp[j+1]
     j +=1
    end
 
    temp[high] = data[i]
   else
    low =0
    high = final

    while low <=high do
     m =(low + high)>>1

     if data[i]>=temp[m]
      low = m + 1
     else
      high = m - 1
     end
    end

    j = final + 1
    final +=1

    while j > low do
     temp[j] = temp[j-1]
     j -=1
    end 

    temp[low] = data[i]
   end
  end 
  p temp 
 end

 i = 0
 for j in first..(len - 1)
  result[i] = temp[j]
  i +=1
 end

 for j in 0..final
  result[i] = temp[j]
  i +=1
 end

 return result
end


data = [4,1,5,6,7,2,9,3,8].shuffle

p data

result = two_way_sort data

p result