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老题目了，POJ上面这种题目好多的。

Posted by yygy at 2013-02-25 15:31:11 on Problem 3279
In Reply To:千万别管字典序。。。。。 Posted by:moretimes at 2012-10-03 22:53:57 
> 顺其自然的枚举就完了
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