elevator_maintainance.py

def sum_two(a, b):
  return int(a) + int(b)

def compare_versions(version_a, version_b):
  a = map(int, version_a.split('.'))
  b = map(int, version_b.split('.'))
  
  first_a, first_b = int(a[0]), int(b[0])
  
  # check if a release number is greater
  if first_a > first_b:
    return 1
  elif first_a < first_b:
    return -1
  
  total_a = reduce(sum_two, a)
  total_b = reduce(sum_two, b)
  
  if total_a == first_a and total_b == first_b:
    if len(a) > len(b):
      return 1
    else:
      return -1
  
  elif total_a > first_a and total_b == first_b:
    return 1
  
  if total_a == first_a and total_b > first_b:
    return -1
    
  print version_a, version_b
  
  return compare_versions('.'.join(map(str, a[1:])), '.'.join(map(str, b[1:])))

def answer(l):
  l.sort(compare_versions)
  return l