Binary Number with Alternating Bits
<p>Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have different values.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> n = 5
<strong>Output:</strong> true
<strong>Explanation:</strong> The binary representation of 5 is: 101
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> n = 7
<strong>Output:</strong> false
<strong>Explanation:</strong> The binary representation of 7 is: 111.</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> n = 11
<strong>Output:</strong> false
<strong>Explanation:</strong> The binary representation of 11 is: 1011.</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= n &lt;= 2<sup>31</sup> - 1</code></li>
</ul>
Bit Manipulation
class Solution:
    def hasAlternatingBits(self, n: int) -> bool:
        prev = -1
        while n:
            curr = n & 1
            if prev == curr:
                return False
            prev = curr
            n >>= 1
        return True
