Ладно давай без массивов попробуем на питоне:

PastNum = int (input ())

Progress = True

NumOfProgress = 0

if PastNum != 0:

   thisNum = int (input ())

   NumOfProgress = thisNum / PastNum

   while thisNum != 0:

       PastNum = thisNum

       thisNum = int (input ())

       if thisNum == 0:

                       break;

       if thisNum / PastNum != NumOfProgress:

           Progress = False;

if Progress == False:

   print ("It isn't a progress");

else:

   print ("It's a progress");