input: Write a function to compute the sum of square numbers in a given range, including the start and end numbers. If the range is invalid (i.e., start is greater than end), return 0.
  def sumOfRanges(start, end):
      if start > end:
          return 0
      
      sum = 0
      
      for i in range(start, end+1):
          sum += i*i
      
      return sum
  
  assert sumOfRanges(10, 20) == 673
  assert sumOfRanges(1, 5) == 55
  assert sumOfRanges(1, 1) == 1
  assert sumOfRanges(2, 2) == 4
  assert sumOfRanges(20, 10) == 0
output: def sumOfRanges(start, end):
      if start > end:
          return 0
      
      sum = 0
      
      for i in range(start, end+1):
          sum += i*i
      
      return sum