
    In a smart parking system where each parking space's occupancy is represented as a binary digit (0 for vacant, 1 for occupied), develop a function that identifies and reserves the next available parking spot by changing its status from vacant to occupied. The function should locate the leftmost vacant spot (represented by 0) in the binary sequence and mark it as occupied (change to 1), effectively implementing a first-available-spot reservation system.
    

    
def set_left_most_unset_bit(n):
    """
    In a smart parking system where each parking space's occupancy is represented as a binary digit (0 for vacant, 1 for occupied), develop a function that identifies and reserves the next available parking spot by changing its status from vacant to occupied. The function should locate the leftmost vacant spot (represented by 0) in the binary sequence and mark it as occupied (change to 1), effectively implementing a first-available-spot reservation system.
    

    """
def set_left_most_unset_bit(n):
    """
    In a smart parking system where each parking space's occupancy is represented as a binary digit (0 for vacant, 1 for occupied), develop a function that identifies and reserves the next available parking spot by changing its status from vacant to occupied. The function should locate the leftmost vacant spot (represented by 0) in the binary sequence and mark it as occupied (change to 1), effectively implementing a first-available-spot reservation system.
    

    """
    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