static int wing=[]()

 {

     std::ios::sync_with_stdio(false);

     cin.tie(NULL);

     return ;

 }();

 class Solution

 {

 public:

     bool hasAlternatingBits(int n)

     {

         n^=n>>;

         return (n&(n+))==;

     }

 };

这里用到了判定一个二进制n，位上全部为1的方法

(n&(n+1))==0

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