①处应填( )
num++
return
++left
--right
②处应填( )
i=j
j++
j=i
j--
③处应填( )
solve(j,right,deep+1)
solve(j+1,right,deep+1)
solve(left,j,deep+1)
solve(left,j-1,deep+ 1)
④处应填()
solve(left,j,deep+1)
solve(j+1,right,deep+1)
solve(j,right,deep+1)
solve(left,j-1,deep+1)
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