Power of Two
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
Example 2:
Input: n = 16
Output: true
Explanation: 24 = 16
Example 3:
Input: n = 3
Output: false
Example 4:
Input: n = 4
Output: true
Example 5:
Input: n = 5
Output: false
Constraints:
-231 <= n <= 231 - 1
Solutions
🧠 Cpp
class Solution
{
public:
bool isPowerOfTwo(int n)
{
return (__builtin_popcount(n) == 1) && (n & 0x7FFFFFFF);
}
};
Last updated
Was this helpful?