图1-7是用14根火柴拼成的平房,要想把它变成楼房,请问至少需要移动几根火柴?
图1-7 l6DAng34rf62V1DJ5KikZpF0BWIv7wuioEH0ukLt8aDNzOW9VpNBl8Y1c47aWu+8