①处应填( )
num<=0
num<=1
num<=2
num<=3
②处应填( )
go(LEFT)
go (RIGHT)
go(LEFT TO RIGHT)
go(RIGHT TO LEFT)
③处应填()
pos[i]=LEFT
pos[i]=RIGHT
pos[i]=LEFT TO RIGHT
pos[i]=RIGHT TO LEFT
④处应填()
hour[i]+go(RIGHT TO LEFT)
hour[i]-go(RIGHT TO LEFT)
hour[i]+go(LEFT TO RIGHT)
hour[i]-go(LEFT TO RIGHT)
⑤处应填()
pos[i]=LEFT
pos[i]=RIGHT
pos[i]=LEFT TO RIGHT
pos[i]=RIGHT TO LEFT
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