LeetCode:326. 3的幂

class Solution {
public:
    bool isPowerOfThree(int n) {
        if(n==0)
        {
            return false;
        }
        while(n%3==0)
        {
            n/=3;
        }
        if(n!=1)
        {
            return false;
        }
        return true;
    }
};