693. Binary Number with Alternating Bits
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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