You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
def longest_unique_substring(s):
  # Set the initial longest length to 0
  longest_length = 0
  # Traverse the string
  for i in range(len(s)):
    seen = set()
    # Traverse from i and outwards
    for j in range(i, len(s)):
      # Check if the character has been seen, if so, break
      if s[j] in seen:
        break
      # Otherwise, add the character to seen and increment the longest_length
      else:
        seen.add(s[j])
        longest_length = max(longest_length, j - i + 1)
  
  return longest_length

s = "ABCBCDDEE"
print(longest_unique_substring(s)) 
user
3
assistant