title: Python for maximum pairwise product
body: <pre><code>n = int(input("Enter the number of elements in the array (2-200,000):"))
  a = [int(x) for x in input("Enter all numbers of the sequence with only non-negative intergers not exceeding 100,000:").split()]
  c = list()3
  
  for i in range(0,n):
      for j in range (1,n):
          if a[i] != a[j]:
              m = a[i]*a[j]
              c.append(m)
          else:
              continue
  print(max(c))
  </code></pre>
  
  <p>This code works. However, I want to define a function to automatically calculating the max product from the 5th line in the code shown below.</p>
  
  <pre><code>def MaxPairwiseProduct(n,a,c):
  for i in range(0,n):
      for j in range (1,n):
          if a[i] != a[j]:
              m = a[i]*a[j]
              c.append(m)
          else:
              continue
  
          Product = max(c)
  
          return Product
  
  n = int(input("Enter the number of elements in the array (2-200,000):"))
  a = [int(x) for x in input("Enter all numbers of the sequence with only non-negative intergers not exceeding 100,000:").split()]
  c = list()
  MaxPairwiseProduct(n,a,c)
  </code></pre>
  
  <p>I re-write the function but it does not work. It reveals "IndentationError: expected an indented block"</p>