231. Power of Two

Given an integer, write a function to determine if it is a power of two.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

class Solution {public:    bool isPowerOfTwo(int n) {    if(n<=0) return 0;int count=0;while(n){if(n%2==1) count++;if(count>1) return false;n/=2;}return true;    }};