[leetcode] Power of Two

From :https://leetcode.com/problems/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.

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Manipulation

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Solution ：

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