Hotel room number

The first building number is 1, and the second building number is: 2;

Each building can be numbered 0 1 on the first floor, 02 on the second floor and 12 on the twelfth floor.

The first room number of each floor is 0 1, the second room number is 02, and the twentieth room number is 20.

For example, the third floor of Building 1/room KLOC-0/8 is:103 18; The seventh room on the second floor of Building 1 1: 2 1 107.