原来只在1楼可以

     █      █                       █████             █   █      
  █        █ █            ████      █             █    █          
█ █       █                   █  █  █             █     ████████         
   █       █              ███████████    █      █      █     █     
█████████          █    █            █        █          █     
   █       █                 ████████           █          █     
   █       █                    █                      █          █              
   ██     ██                  █ █████           █        ██     
 ██     ██                    █ █      █           █      █  █ █     
   █    █ █                   █    █   █            █     █   █   █      
   █       █                  █      █ █             █          █      
   █        █                █        █               █          █     
 ██         ██            █     ██  ██           █       ███