
    Given a user's interest profile represented as a binary number, develop a function that identifies and activates the leftmost inactive interest category (converting the leftmost 0 to 1) to expand the user's potential matching criteria in the friend recommendation system. The function should maintain the existing active interests while adding exactly one new interest category to broaden the user's social connection possibilities.
    

    
def set_left_most_unset_bit(n):
    """
    Given a user's interest profile represented as a binary number, develop a function that identifies and activates the leftmost inactive interest category (converting the leftmost 0 to 1) to expand the user's potential matching criteria in the friend recommendation system. The function should maintain the existing active interests while adding exactly one new interest category to broaden the user's social connection possibilities.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a user's interest profile represented as a binary number, develop a function that identifies and activates the leftmost inactive interest category (converting the leftmost 0 to 1) to expand the user's potential matching criteria in the friend recommendation system. The function should maintain the existing active interests while adding exactly one new interest category to broaden the user's social connection possibilities.
    

    """
    if not n & n + 1:
        return n
    (pos, temp, count) = (0, n, 0)
    while temp:
        if not temp & 1:
            pos = count
        count += 1
        temp >>= 1
    return n | 1 << pos