比如2006-1-1 10
2006-1-2 20
2006-01-31 30
2007-1-1 11
2007-1-2 21
2007-01-31 35
2008-1-1 10
2008-1-2 20
2008-01-31 30
得到这样的结果
如2006-1-1 10 10
2006-1-2 20 30
2006-01-31 30 60
2007-1-1 11 11
2007-1-2 21 32
2007-01-31 35 67
2008-1-1 10 10
2008-1-2 20 30
2008-01-31 30 60


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