
    Given a user's interest profile represented as a binary number where each bit position corresponds to a specific interest category, develop a function that identifies and activates the leftmost inactive interest category (represented by 0) by setting it to 1, helping expand the user's potential matching criteria for friend recommendations.
    

    
def set_left_most_unset_bit(n):
    """
    Given a user's interest profile represented as a binary number where each bit position corresponds to a specific interest category, develop a function that identifies and activates the leftmost inactive interest category (represented by 0) by setting it to 1, helping expand the user's potential matching criteria for friend recommendations.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a user's interest profile represented as a binary number where each bit position corresponds to a specific interest category, develop a function that identifies and activates the leftmost inactive interest category (represented by 0) by setting it to 1, helping expand the user's potential matching criteria for friend recommendations.
    

    """
    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