
    Given a binary representation of a delivery network's road segments where 1 indicates an available road and 0 indicates an unavailable road, write a function that identifies and activates (sets to 1) the leftmost inactive road segment. The function should help fleet managers quickly adapt routes by opening alternative road segments when existing paths become congested or weather-affected.
    

    
def set_left_most_unset_bit(n):
    """
    Given a binary representation of a delivery network's road segments where 1 indicates an available road and 0 indicates an unavailable road, write a function that identifies and activates (sets to 1) the leftmost inactive road segment. The function should help fleet managers quickly adapt routes by opening alternative road segments when existing paths become congested or weather-affected.
    

    """
def set_left_most_unset_bit(n):
    """
    Given a binary representation of a delivery network's road segments where 1 indicates an available road and 0 indicates an unavailable road, write a function that identifies and activates (sets to 1) the leftmost inactive road segment. The function should help fleet managers quickly adapt routes by opening alternative road segments when existing paths become congested or weather-affected.
    

    """
    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