Power of Two

c++

class Solution {
public:
    bool isPowerOfTwo(int n) {
        if (n < 1)
            return false;
        return (n&(n - 1)) == 0;
    }
};

python

class Solution(object):
    def isPowerOfTwo(self, n):
        """
        :type n: int
        :rtype: bool
        """
        if n < 1:
            return False

        return (n&(n-1))==0