two_sum is a Python function that takes in a list of integers (elements) and an integer number (num) and returns True if there exist two values in elements that add up to num, otherwise, function returns False. def two_sum(elements: List[int], num: int):     for i in range(len(elements)):         for j in range(i + 1):             if elements[i] + elements[j] == num:                 return True     return False Study above function and answer below questions:   A. What is time complexity of two_sum? B. Is it possible to improve on above algorithm performance (in terms of its asymptotic cost)? If yes, describe your algorithm, be detailed as much as possible.

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