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居然过了，不过，这个很重要，我还不会，学的人家的。

Posted by lcjh at 2009-07-02 15:22:44 on Problem 2724 
判断二进制是否之差一位，我一开始自己写得，后来发现有这个好东西，位运算太强大了！
C=A^B;
C&&((C&(C-1))==0)
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