Given an integer n, return true if it is a power of two. Otherwise, return false.
An integer n is a power of two, if there exists an integer x such that n == 2x.
Example 1:
Input: n = 1
Output: true
Explanation: 20 = 1
class Solution {
public:
bool isPowerOfTwo(int n) {
if (n <= 0){
return false;
}
else if ((n & (n - 1)) == 0){
return true;
}
else {
return false;
}
}
};
