231. Power of Two (Easy)
https://leetcode.com/problems/power-of-two/
Given an integer, write a function to determine if it is a power of two.
Example 1:
Input: 1 Output: true Explanation: 20 = 1
Example 2:
Input: 16 Output: true Explanation: 24 = 16
Example 3:
Input: 218 Output: false
Solutions
class Solution {
public boolean isPowerOfTwo(int n) {
if (n <= 0) {
return false;
}
// 000100
// 000011
return (n & (n - 1)) == 0;
}
}