Given an integer, write a function to determine if it is a power of two.
Example 1:
Input: 1
Output: true
Explanation: 20 = 1Example 2:
Input: 16
Output: true
Explanation: 24 = 16Example 3:
Input: 218
Output: falseclass Solution {
public:
bool isPowerOfTwo(int n) {
if(n <= 0) {
return false;
} else {
return !(n&(n-1));
}
}
};