Review the AI

Any Duplicates?

Three AI models answered the same task. Label each solution: correct, correct but slow, or buggy.

Problem

has_duplicate(values): return True if any value appears twice, otherwise False.

Solution A

1def has_duplicate(values):

2 for i in range(len(values)):

3 for j in range(i + 1, len(values)):

4 if values[i] == values[j]:

5 return True

6 return False

Solution B

1def has_duplicate(values):

2 seen = set()

3 for v in values:

4 if v in seen:

5 return True

6 seen.add(v)

7 return False

Solution C

1def has_duplicate(values):

2 return len(values) == len(set(values))