leetcode-problemset/leetcode-cn/problem (English)/交替位二进制数(English) [binary-number-with-alternating-bits].html

<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>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>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>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>