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

class Solution {

    public boolean isPowerOfTwo(int n) {

        return n > 0 && (n & (n - 1)) == 0;

    }

}

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