There is a residential area to be developed in a southern city. The base is flat, 300 meters wide from east to west, 450 meters long from south to north, and close to the urban trunk road in the north. Its red line is 30 meters wide. It is required that the gross density of the population in the residential area should not be less than 500 people/hectare, and the average number of floors of the residential area should not exceed 10. The population of each household is calculated as 3.5 people. The residential type is mainly two rooms and one hall and three rooms and one hall. The public service facilities that must be set up in the community include: (1) kindergarten, (2) department store, (3) small supermarket, (4) neighborhood committee, (5) medical center, (6) substation, (7) barber shop, (8) photo studio, (9) public toilet, (10) garbage disposal ..