342. 4的幂 

1 class Solution 
2 {
3 public:
4     bool isPowerOfFour(int num) 
5     {
6         return (num > 0) && ((num & (-num)) == num) && (num % 3 == 1);
7     }
8 };

 

posted @ 2020-04-21 17:44  Jinxiaobo0509  阅读(90)  评论(0)    收藏  举报