1,1,2,2,3,4,3,5,( )

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1,1,2,2,3,4,3,5,( )

1,1,2,2,3,4,3,5,( )
1,1,2,2,3,4,3,5,( )

1,1,2,2,3,4,3,5,( )
思路一:1,(1,2),2,(3,4),3,(5,6)=>分1、2、3和(1,2),(3,4),(5,6)两组.